name | Amanita recutita sensu Coker |
name status | sensu |
english name | "Woody-Stemmed Coker's Caesar" |
synonyms |
non Agaricus (Amanita) recutita Fr. (=A. porphyria) |
images | |
intro |
The following macroscopic description of Amanita recutita is based largely on (Coker, 1917). |
cap |
The cap of this species is 40 - 85 mm wide (most often near 60 mm), "light pallid tan" with a tint of "smoky pink, fading to nearly white" at margin or tannish gray. It is hemispheric at first, then planoconvex to planar; at maturity it is sometimes centrally depressed. It has no umbo. The cap's flesh is white (about 5 mm thick over the stipe) and thins rather evenly to the cap margin. The latter is short striate (about 10 - 15 % of the cap radius at most) and nonappendiculate; it is incurved at first and then becomes decurved. Remnants of volva are often absent from the cap. When they are present, they appear as scattered soft white patches over the center and are membranous to submembranous. |
gills |
The gills are very narrowly attached to the stem with a decurrent line on the stem apex; they are moderately close, "pure white" (Coker) to yellowish cream (in age?). They are roughly spindle-shaped, but are rounded broadly at their outer ends. The gills are up to 10 - 13 mm broad and are seen to project quite prominently below the cap margin. Short gills are truncate, of diverse lengths, and rather common (although not between every pair of gills). |
stem |
The stem is 62 - 77+ × 8 - 10.5 mm, usually subcylindric, infrequently narrowing downward, and smooth or with some fibrillose decoration. In the upper part, the stem is white or palely similar in color to the cap. The flesh of the stem is pale tannish white, very lightly stuffed, and has a central cylinder that becomes hollow when the stem is sectioned. In addition, the stem flesh is extremely firm and unusually wood-like for an Amanita. The stem's ring is nearly white or colored similarly to the cap ("not as smoky as in A. spreta" according to Coker), thin, rather fragile, skirt-like at first, decorated with light flocculence on the underside, and originally located 25 - 30 mm below the top of the stem. The ring often falls away by maturity or in age. The volva on the stem base takes the form of a rather short sac attached near the stem's base and sheathing the lower stem. This sac is soft, thick (when very fresh), submembranous to membranous, often rather fragile (e.g., breaking up when collected leaving fragments in the soil), and usually buried to its upper (more or less uneven) edge in soil. |
spores |
The spores of this species (combining those from Coker's collection with those of a recent collection) are (9.0-) 10.2 - 14.0 (-14.5) × (5.6-) 5.8 - 7.5 (-9.5) µm, ellipsoid to elongate, infrequently cylindric, and inamyloid. Clamps are rather common at bases of basidia. |
discussion |
Until recently, this rather odd species was known only from the area of Chapel Hill, North Carolina (U.S.A.). Coker recorded no woody plants in the area in which he collected his material. When the species was collected again recently (see below), it was found with oak (Quercus). Coker reported the species to be odorless and tasteless. He noted some similarity to Amanita spreta (Peck) Sacc., but pointed out that the gills of that species were narrower, the ring a more dark and smoky color, and the volval sac more robust. In reviewing all material labeled "recutita" in Coker's herbarium, I found that, excluding the single 1915 collection, the material was of a different species, probably A. virginiana (Murrill) Murrill. On the other hand, one of Coker's two plates labeled "A. pubescens" (see A. pubescens sensu Coker) in his 1917 monograph on Amanita appears to depict material of A. recutita sensu Coker which has lost its ring. The only collections that can be confirmed since Coker's of 1915 were recently (2007 and 2008) made in southwestern Connecticut, U.S.A. The 2007 collector was Connie Borodenko, a person with an uncanny knack for finding rare, undescribed, or otherwise noteworthy fungi. When the material was examined, some surface drying had taken place; this may have altered the cap color. The ring had been lost from the stem. The specimen was compared macroscopically and microscopically to the single collection of Coker. The match was good. In the following year, Connie gave me a map to the spot along the Salmon River, and I was able to find the species again.—R. E. Tulloss |
brief editors | RET |
name | Amanita recutita sensu Coker | ||||||||||||||||||||
author | sensu Coker. 1917. J. Elisha Mitchell Scient. Soc. 33(1/2): 26. [p.p.] [Excluding material included by Singer (1948) in his A. cokeriana.] | ||||||||||||||||||||
name status | sensu | ||||||||||||||||||||
english name | "Woody-Stemmed Coker's Caesar" | ||||||||||||||||||||
GenBank nos. |
Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages.
These pages will eventually be made live, so try again later.
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intro | The macroscopic description that follows is based largely on Coker’s description, although additional information is being added as recent collections are identified as belonging to the present species. The microscopic description is based on original research of R. E. Tulloss. | ||||||||||||||||||||
pileus | 40 - 85 mm (often about 60 mm) wide, "light pallid tan" with tint of "smoky pink, fading to nearly white" (Coker, 1917) at margin or ??, hemispheric at first, then planoconvex to planar, sometimes with central depression, not ubonate; context white, 5 mm thick over stipe, thinning rather evenly to margin; margin short striate (appox. 0.1R - 0.15R), nonappendiculate, incurved at first, becoming decurved; universal veil often absent, as scattered soft white patches over disc and membranous to submembranous. | ||||||||||||||||||||
lamellae | very narrowly adnate with decurrent line on stipe apex, moderately close, "pure white" (Coker, 1917) to yellowish cream (in age?), somewhat intervenose? (Coker, 1917), subventricose and rounded broadly at outer end, up to 10 - 13 mm broad, projecting below pileus margin; lamellulae truncate, of diverse lengths, rather common (although not between every pair of lamellae). | ||||||||||||||||||||
stipe | 62 - 77+ × 8 - 10.5 mm, usually subcylindric, infrequently narrowing downward, smooth or with some fibrillose decoration, white or palely concolorous with pileus above; context pale tannish white, very lightly stuffed, with central cylinder becoming hollow when sectioned, very firm or woody in comparison to other amanitas of sect. Caesareae; partial veil nearly white or palely concolorous with pileus ("not as smoky as in A. spreta" according to Coker), thin, rather fragile, skirt-like at first, at first located 25 - 30 mm below stipe apex, often deciduous, with light flocculence below; universal veil as rather short saccate volva attached near stipe base, sheathing lower stipe, soft, thick, submembranous to membranous, often rather fragile (e.g., breaking up when collected with portions remaining in substrate), usually entirely inserted in substrate, opening approximately circumcissilly, with upper edge more or less uneven. | ||||||||||||||||||||
odor/taste | Both lacking according to Coker (1917). | ||||||||||||||||||||
macrochemical tests |
none recorded. | ||||||||||||||||||||
stipe context | longitudinally acrophysalidic; filamentous, undifferentiated hyphae 2.5 - 4.4 µm wide, ?, plentiful in interior, dominant? near external surface; acrophysalides up to 80± × 11.5 - 14.0± µm, with apparently thickened walls (up to 1.2 µm thick), narrow, closely packed, dominating interior tissue, narrowly clavate to subcylindric; vascular hyphae ? µm wide, ?. | ||||||||||||||||||||
lamella edge tissue | sterile. | ||||||||||||||||||||
basidiospores | [97/4/2] (9.0-) 10.2 - 14.0 (-14.5) × (5.6-) 5.8 - 7.5 (-9.5) µm, (L = 10.9 - 12.9 µm; L’ = 11.9 µm; W = 6.1 - 6.8 µm; W’ = 6.6 µm; Q = (1.56-) 1.62 - 2.0 (-2.57); Q = 1.73 - 1.89; Q’ = 1.80), hyaline, colorless, smooth, thin-walled, inamyloid, ellipsoid to elongate to (occasionally) cylindric, adaxially flattened; apiculus sublateral, cylindric; contents dominantly granular with occasional small guttules to dominantly monoguttulate with additional small granules; ? in deposit. | ||||||||||||||||||||
ecology | Solitary to subgregarious. Connecticut: In sandy soil of riverine habitat near Quercus following abnormally hot weather (35° - 40°C) and subsequent heavy rains. | ||||||||||||||||||||
material examined | U.S.A.: CONNECTICUT—Middlesex Co. - Salmon R. St. For. southern section [41°32’57” N/ 72°27’05” W], 23-24.viii.2007 Connie Borodenko s.n. [RET 8-23/24-07-Z] (RET 410-6), 22.viii.2008 R. E. & M. A. Tulloss 8-22-08-A1 (RET 420-2), 2.viii.2009 COMA foray participant s.n. (RET 437-5). NORTH CAROLINA—Orange Co. - Chapel Hill, 6.ix.1915 W. C. Coker 1684a, W. C. Coker 1684b (UNC). OKLAHOMA—Oklahoma Co. - Edmond, Hafer Pk. [35.6422° N/ 97.4558° W, 327 m], ?? Clark L. Ovrebow 4809b (CSU, nrITS, & tef1-α seq'd.). . | ||||||||||||||||||||
discussion |
Comparing the only A. recutita sensu Coker
nrITS sequence
available in GenBank (original voucher determined by
Dr. Clark Ovrebo and RET) to seven nrITS sequences
from material determined as
A. spreta by RET
and deposited in our local
database we got the following results: The alignments were trimmed to extend from the first character of ITS to the 442nd. There are four columns with character variation in the alignment. Character positions 61 and 365 contain single nucleotide polymorphisms (SNPs). So their variations are properties of A. spreta. The two other "troubled’ columns contain what appears to be a quality problems constrained to one of the eight sequences…from a specimen originally identified as A. spreta. The range of genetic distance within the group as a whole is the same as the range when the “recutita” specimen is removed from the alignment—-0.0 – 0.8%. The range when the “troubled” specimen is removed from consideration is reduced to the impact of the SNPs: 0.0 – 0.5%. In other words, allowing for the SNPs, the apparently undamaged sequences seem to represent a single taxon. Unfortunately, we can only compare with relation to a single specimen originally deterimined as recutita sensu Coker. With nrLSU alone,the result is similar. The following spororgraph experiment, carried out following a suggestion from Ron Pastorino, also gave me the idea of comparing spores from recutita sensu Coker with those we have observed in material of A. spreta: However, the multi-gene tree of Sánchez-Ramírez et al. (2014) includes rpb2 and tef1-α when available and segregates A. spreta, A. belizeana, and the present species with strong support. Some collections originally cited as "A. recutita sensu Coker" have proven to be Amanita pubescens sensu Coker. This confusion can be traced back to Coker's original publication; his collections of the two taxa are sometimes mixed. | ||||||||||||||||||||
citations | —R. E. Tulloss and S. Sánchez-Ramírez | ||||||||||||||||||||
editors | RET | ||||||||||||||||||||
Information to support the viewer in reading the content of "technical" tabs can be found here.
name | Amanita recutita sensu Coker |
name status | sensu |
english name | "Woody-Stemmed Coker's Caesar" |
images | |
photo |
Coker (1917) - (1-2) North Carolina, U.S.A. RET - (3) Salmon River State Forest, Connecticut, U.S.A. |
name | Amanita recutita sensu Coker |
bottom links |
[ Keys & Checklists ] [ Great Smoky Mtns. N.P. & region list ] [ Draft description of, & key to, sect. Caesareae ] |
name | Amanita recutita sensu Coker |
bottom links |
[ Keys & Checklists ] [ Great Smoky Mtns. N.P. & region list ] [ Draft description of, & key to, sect. Caesareae ] |
Each spore data set is intended to comprise a set of measurements from a single specimen made by a single observer; and explanations prepared for this site talk about specimen-observer pairs associated with each data set. Combining more data into a single data set is non-optimal because it obscures observer differences (which may be valuable for instructional purposes, for example) and may obscure instances in which a single collection inadvertently contains a mixture of taxa.