name | Amanita yenii |
name status | nomen acceptum |
author | Zhu L. Yang & C. M. Chen |
english name | "Yen's Lepidella" |
images | |
cap |
The cap of Amanita yenii is 50 - 100 (-120) mm wide, convex to applanate, white to whitish or dirty white, but cream-colored or pale yellowish over the center when young. The volval remnants on the cap are conical to subconical, 1 - 3 (-4) mm high and 1 - 3 (14) mm wide, white to dirty white, occasionally brownish, especially towards their tips, and randomly arranged; the cap's margin is smooth and appendiculate. |
gills |
The gills are white when young, becoming cream-colored to yellowish when mature. |
stem |
The stem is 60 - 120 × 5 - 15 mm, subcylindrical or tapering upwards, with the apex slightly expanded, white, with the upper half often covered with recurving squamules. The stem's basal bulb is clavate to subclavate or ventricose, 10 - 30 mm wide, non-marginate, with the upper part nearly completely glabrous or covered with whitish to white, occasionally brownish, verrucose to subconical volval remnants, irregularly arranged or in incomplete concentric rings. The stipe's annulus is thin and nearly membranous. The flesh is white and unchanging. |
spores |
The basidiospores of Amanita yenii are (6.5-) 7.5 - 10.0 (-12.5) × (4.0-) 4.5 - 6.5 (-7.5) µm and are ellipsoid to elongate, amyloid, colorless, hyaline, thin-walled, and smooth. There are no clamps at bases of basidia. |
discussion |
Amanita yenii grows in forests. To date it has been found in both southern China and Taiwan. Amanita polypyramis (Berk. & M. A. Curtis) Sacc., A. pulverulenta Beeli, and A. boudieri Barla of Bas' stirps Polypyramis are similar to A. yenii. Amanita polypyramis, originally described from North America, usually has a more robust basidiome, often with strong smell, smaller warts of volval remnants on the cap, paler colored gills, a more or less submarginate bulb on the base of the stem and significantly larger basidiospores. Amanita boudieri, originally described from Europe, has a more fugacious annulus, and much longer basidiospores. Furthermore, its volval remnants on the cap are mostly rather adnate, subtomentose-subfelted patches or small warts, and its stipe is glabrous to subglabrous, without reflexed squamules on its upper part.—Zhu L. Yang Amanita pulverulenta, originally described from the Republic of Congo, has a somewhat more robust fruiting body, has a more robust, membranous annulus, lacks recurved squamules on the stem, has yellow or tan tints in the center of the cap at maturity, and has larger spores.—Zhu L. Yang |
brief editors | RET |
name | Amanita yenii | ||||||||
author | Zhu L. Yang & C. M. Chen. 2003. Mycotaxon 88: 456. | ||||||||
name status | nomen acceptum | ||||||||
english name | "Yen's Lepidella" | ||||||||
etymology | genitive of a Latinized name, "Yen's" or "of Yen" | ||||||||
MycoBank nos. | 489641 | ||||||||
GenBank nos. |
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holotypes | HKAS | ||||||||
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 drawn entirely from the protolog of the present species. | ||||||||
basidiospores |
from protolog: [322/13/12] (6.5-) 7.5 - 10.0 (-12.5) × (4.0-) 4.5 - 6.5 (-7.5) μm,
( | ||||||||
ecology | At 600 - 900 m elev. In forests. | ||||||||
material examined | from protolog: CHINA: HAINAN—Changjiang Li Autonomous Co. - Bawangling, 21.viii.1990 Q. Chen s.n. (paratype, GDGM 16681). Ledong Li Autonomous Co. - Jianfengling, 5.v.1960 J. H. Yu & R. Liu 1277 (paratype, HMAS 29133), 18.viii.1999 M. S. Yuan 4318 (paratype, HKAS 34567), 2.ix.1999 X. L. Wu 7 (paratype, paratype, HKAS 34097), 3.ix.1999 X. L. Wu 9 (HKAS 34099). YUNNAN—Xishuangbanna Dai Autonomous Prefecture - Jinghong (county level) City, Dadugang, 7.viii.2001 Z. L. Yang 3165a (paratype, HKAS 41113). TAIWAN: Nantou Co. - Huisun For. Stn., 10.viii.2000 C. M. Chen 2414 (paratype, HKAS 37136), 5.vi.2002 C. M. Chen 3284 (holotype, HKAS 41328), 24.vi.2002 C. M. Chen 3329 (paratype, HKAS 41326), 4.ix.2002 C. M. Chen 3570 (paratype, HKAS 41327). | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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name | Amanita yenii |
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name | Amanita yenii |
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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.