Amanita hunanensis

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name	Amanita hunanensis
name status	nomen acceptum
author	Y. B. Peng & L. H. Liu
english name	"Hunan Slender Caesar"
intro	The following is based on the descriptions by Peng and Liu (1981) and Yang and Zhang (2002).
cap	The cap of A. hunanensis is 40 - 130 mm wide, dark gray-brown at first, paler towards the margin, becoming paler upon expansion but when the center remaining dark and with concentric circles of dark spots ranging from a solid-colored center at least part of the way through the striate area towards the margin, at first hemispheric, then convex to plano-convex, with a long striate (60% or more of the radius) and nonappendiculate margin, commonly splitting. The volva is often present on the cap as one or more membranous patches. The flesh is white.
gills	The gills are crowded, free, and white. Short gills are present.
stem	The stem is 70 - 140 × 5 - 20 mm, white with gray-brown squamules arranged in irregular concentric bands from the underside of the ring to the top of the volval limb, hollow, fleshy, narrowing upward. The ring is membranous, persistent, thin, skirt-like, placed anywhere between one-quarter distance from the top to slightly below the midpoint of the stem, grayish white on the upper surface, and dark brownish gray on the lower surface. The volva is short saccate, white on the outer surface, inner surface probably concolorous with the cap [illustration shows dark inner surface], and 15 - 35 × 15 - 35 mm.
spores	Peng and Lui (2002) reported the spore to be 8.5 - 14 × 7.5 - 9.5 µm, ellipsoid and inamyloid. Clamps are present at bases of basidia. Spores measured from an isotype by Yang and Zhang (2002) are 10.0 - 12.0 × 6.5 - 8.0 µm.
discussion	This species was originally described from a pine forest in the province of Hunan, China, in which it occurred in large groups. The authors point out that the patterning of the cap skin with concentric circles of dark spots is unique among similar taxa. A. hunanensis can be placed in Amanita stirps Hemibapha. ZLY currently views this species as close to A. esculenta Hongo & I. Matsuda and A. yuaniana Zhu L. Yang.—R. E. Tulloss and L. Possiel
brief editors	RET

name

Amanita hunanensis

author

Y. B. Peng & L. H. Liu. 1981. Acta Microbiol. Sin. 21(2): 152-153, pl. 1.

name status

nomen acceptum

english name

"Hunan Slender Caesar"

MycoBank nos.

111108

GenBank nos.

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accession	locus	voucher	source

holotypes

HNNU; isotype, HMAS (per Yang and Zhang. 2002. Acta Bot. Yunnanica 24(6): 718.)

revisions

Revision: Yang and Zhang. 2002. Acta Bot. Yunnanica 24(6): 718, fig. 1.

intro

The following text may make multiple use of each data field.

The field may contain magenta text presenting data from a type study and/or revision of other original material cited in the protolog of the present taxon. Macroscopic descriptions in magenta are a combination of data from the protolog and additional observations made on the exiccata during revision of the cited original material.

The same field may also contain black text, which is data from a revision of the present taxon (including non-type material and/or material not cited in the protolog). Paragraphs of black text will be labeled if further subdivision of this text is appropriate.

Olive text indicates a specimen that has not been thoroughly examined (for example, for microscopic details) and marks other places in the text where data is missing or uncertain.

The following material is derived from the protolog of the present species and from (Yang and Zhang 2002).

pileus

from protolog: 40 - 130 mm wide, dark gray-brown over disc and paler toward margin, at first hemispheric, then convex, concentrically decorated with squamules; context white; margin striate (ca. 0.5R (per figure)), rarely splitting; universal veil as several irregular pallid patches (per figure).

lamellae

from protolog: free, crowded, white; lamellulae present.

stipe

from protolog: 70 - 140 × 5 - 20 mm, white, decorated with gray-brown squamules, narrowing upward; context fleshy, hollow; partial veil median to superior, membranous, thin, pendent, gray-white above, fuscous-gray below; universal veil as saccate volva, white, membranous, 15 - 35 × 15 - 35 mm.

odor/taste

not recorded.

macrochemical
tests

none recorded.

basidia

from protolog: 50 - 62 × 11 μm.

basidiospores

from protolog: [-/-/-] 8.5 - 14 × 7.5 - 9.5 μm, (est. Q = 1.13 - 1.47; est. Q' = 1.32), hyaline, inamyloid, ellipsoid; apiculus not described; contents not described; white in deposit. [Note: An estimate for the range of Q is provided in order that an approximate sporograph can be generated.—ed.]

ecology

from protolog: Gregarious. At 400 m elev. In Pinus forest.

material examined

from protolog: CHINA: HUNAN—Xupu [400 m], 25.v.1975 Y. B. Peng & L. H. Liu 1224 (holotype, MHHNU; isotype, HMAS 47351).

discussion

This species is eaten in Hunan Province.

Apparently the authors were incorrect in judging that there was a bulbous base to the stipe of the present species.

citations

—R. E. Tulloss

editors

RET

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name	Amanita hunanensis
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