name | Amanita imazekii |
name status | nomen acceptum |
author | T. Oda, C. Tanaka & Tsuda |
english name | "Imazeki ?Slender Caesar" |
images | |
intro | The following description is based on the original description by Oda, Tanaka, and Tsuda (2001). |
cap | The cap of A. imazekii is 65 - 140 mm wide, brown to grayish brown at the center, often paler towards the margin, at first hemispherical, then convex to planar, with the margin uplifted in age and a short-striate margin (about 10 - 25% of the radius). The flesh is white and 6 - 12 mm thick over the stem. |
gills | The gills are free to remote, attenuate, 6 - 10 mm broad, white to pale creamy, crowded, with a pruinose to slightly floccose edge. The short gills are moderately frequent and truncate to subtruncate. |
stem | The stem is 140 - 255 × 8 - 34 mm, narrowing upwards (dramatically so in illustration), white to pale cream, frosted or slightly powdery, sometimes slightly fibrillose or slightly scaly, and stuffed becoming hollow. The ring is attached in the upper part or near the middle of the stem, white, membranous, persistent, striate on the upper surface (according to the illustration). The saccate volva is white to pale creamy on the exterior, attached to the stem at the lower one-third to two-thirds; the free limb is thick in the upper part. The volval sac is 25 - 45 mm wide and encompasses one-third to one-half of the stem. |
spores | The spores measure (8.0-) 8.8 - 10.8 (-12.0) × (7.6-) 8.4 - 10.4 (-10.8) µm and are globose to subglobose and inamyloid. Clamps are present at bases of basidia. |
discussion |
This species is originally described from and is only know from central and eastern parts of the Japanese archipelago where it occurs with a large number of potential symbionts including firs (Abies), pines (Pinus), oaks (Quercus), and larches (Larix). It occurs alone or in small groups. According to the illustration, mature basidia arise from inflated cells in one or two layers. However, the text of the original description emphasizes the uninflated or partially uninflated and frequently branching nature of the subhymenium. Hence placement of this species in a stirps is not completely clear although both stirps Hemibapha and stirps Calyptroderma are possible. A revision of the type should clarify the matter. This species holds a rather isolated position in this site's world key to section Caesareae.—R. E. Tulloss and L. Possiel |
brief editors | RET |
name | Amanita imazekii | ||||||||
author | T. Oda, C. Tanaka & Tsuda. 2001. Mycologia 93(6): 1231-1234, figs. 1-5. | ||||||||
name status | nomen acceptum | ||||||||
english name | "Imazeki ?Slender Caesar" | ||||||||
MycoBank nos. | 474883 | ||||||||
GenBank nos. |
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holotypes | TNS | ||||||||
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 from the protolog of the present species. [NOTE: Spore measurements from papers by Z. L. Yang use his "Times New Roman" face for "Q" and "Q'"—respectively, " | ||||||||
basidiospores |
from protolog: [160/8/8] (8.0-) 8.8 - 10.8 (-12.0) × (7.6-) 8.4 - 10.4 (-10.8) μm, ( | ||||||||
ecology | from protolog: Solitary or gregarious. At 20 - 2000 m elev. With Abies sachalinensis or in mixed forest with Pinus thunbergii and Quercus serrata or with A. veitchii and A. mariesii and Larix kaempferi or in mixed forest of Abies and Q. mongolica var. grosseserrata. | ||||||||
material examined | from protolog: JAPAN: HOKKAIDO—Hokkaido-ko - Nashike-cho, Syokanso, 24.viii.1997 T. Shirakawa s.n. (paratype, TNS F-101520). Muroranshi, Mt. Muroran, 25.viii.1997 Y. Nishihara s.n. (paratype, CBM FB24749), s.n. (paratype, TNS F-101521), s.n. (paratype, TNS F-101522). HONSHU—Chiba-ko - Sakae-machi, Boso-Fudokinooka, 6.x.1991 Chiba Nat. Hist. Mus. Inst. Foray participant s.n. (paratype, CBM FB-3390). Gifu-ko - Takane-mura, Hiwada Kogen, 12.ix.1996 T. Oda s.n. (holotype, TNS F-101519), 13.ix.1996 T. Oda s.n. (paratype, CBM FB-24747), 24.ix.2000 T. Oda s.n. (paratype, CBM FB-30245), s.n. (paratype, CMB FB-30246). Shizuoka-ko - Oyama-cho, Subashiriguti, 29.viii.1998 M. Kawamura s.n. (paratype, CMB FB-24748). | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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name | Amanita imazekii |
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name | Amanita imazekii |
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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.