| name |
Amanita demissa |
| author |
Corner & Bas. 1962. Persoonia 2: 272, pl. 5a, 6a, figs. 28-29. |
| name status |
nomen acceptum |
| english name |
"Singapore Amanita" |
| etymology |
demissus, "lowered" or "let down"; regarding the inferior position of the partial veil. |
| MycoBank nos. |
326091 |
| GenBank nos. |
Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages.
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|
| holotypes |
L |
| 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 entirely from the protolog of the present taxon. |
| pileus |
from protolog: 15 - 35 mm wide, grayish umber to umber-gray, paler toward margin, becoming pale brownish gray or gray over disc and whitish at margin, campanulate to plano-convex, becoming plane at last, sometimes slightly umbonate, sometimes slightly depressed in center, presumably slightly viscid; context soft, white, 1.5 - 2.5 mm thick above stipe, very thin above lamellae; margin striate (0.3 - 0.35R); universal veil as sprinkling of minute, soft, scurfy, fuliginous, easily separable warts, 0.3 × 0.5 - 1 mm and as conical warts over disc. |
| lamellae |
from protolog: free, not crowded, white, thin, 1.5 - 3 mm broad, 34 - 43 primaries; lamellulae attenuate, 1 - 3 between each otherwise adjacent pair of lamellae. |
| stipe |
from protolog: 25 - 50 × 2 - 3 mm (width measured at apex), pale grayish white with white apex or wholly pallid whitish, slightly fibrillose, narrowing upward; bulb 3 - 6 mm wide;, context hollow (cavity not drawn in all figures), brittle; partial veil narrow, pendent, median or submedian, "not spreading," white, with fuliginous scurfy particles on edge; universal veil as 1 - 3 faint uneven raised circles of fine grayish pruina on upper half of bulb (per figure). |
| odor/taste |
from protolog: Odor slight and indistinct. Taste not recorded. |
macrochemical
tests |
none reported. |
| pileipellis |
from protolog: comprising two layers; suprapellis as thin gelatinous matrix; subpellis somewhat thicker ungelatinized; filamentous hyphae brown, 1.5 - 3 µm wide (very distant and irregularly disposed) in suprapellis, up to 8 µm wide (crowded, slightly interwoven, radially organized) in subpellis. [Note: A suprapellis with colored hyphae rather sparsely populating a gelatinous matrix is known from several taxa in other sections of Amanita; e.g., A. flammeola, A. dunicola, and A. sampajensis in sect. Vaginatae come to mind.nbsp; This makes me wonder whether such colored hyphae in the suprapellis might be unusually colored vascular hyphae (which often may pass undamaged through a fully gelatinized suprapellis) or hyphae of an invading hyphomycete, in one or more of these cases.—ed.] |
| pileus context |
not described. |
| lamella trama |
from protolog: "impossible to analyze in dried material." |
| subhymenium |
from protolog: "impossible to analyze in dried material." |
| basidia |
from protolog: 28 - 40 × 90 - 10.5 µm, dominantly 4-, rarely 3- or 2-sterigmate, with sterigmata 3 µm long; clamps not observed. |
| universal veil |
from protolog: On pileus: filamentous hyphae 2.5 - 6 µm wide, rather scarce; inflated cells dominating, 15 - 55 (- 80) µm wide, thin-walled, smooth, ca. globose to subglobose, with pale fuliginous contents, terminal mostly in long anticlinal chains or (sometimes) singly. On stipe base: filamentous hyphae plentiful, interwoven; inflated cells globoose to subglobose, brown. |
| stipe context |
from protolog: longitudinally acrophysalidic; acrophysalides cylindric to cigar-shaped, up to 420 × 45 µm, sometimes subtended by one similar cell or short chain of similar cells. |
| partial veil |
not described. |
| lamella edge tissue |
from protolog: inflated cells 16 - 40 µm wide, scattered along gill-edge. |
| basidiospores |
from protolog: [-/-/-] 6.4 - 8.5 (-10.1) × 4.7 - 6.4 μm, (Q = 1.10 - 1.50 (-1.60); Q = 1.30),
hyaline, colorless, smooth, thin-walled, amyloid, broadly ellipsoid to ellipsoid, often dorsally flattened; apiculus sublateral in illustration; contents monoguttulate or cloudy granular; color in deposit not reported.
Spore from fresh material: 7.0 - 9.5 × 5.0 - 6.5 μm. |
| ecology |
from protolog: "Terrestrial in forest; occurring every rainy season (March-April, Aug.-Sept.); developing quickly; nearly always solitary and scarce." |
| material examined |
from protolog: SINGAPORE: Bukit Timah, 21.viii.1939 E. J. H. Corner s.n. (holotype, L), 3.ix.1940 E. J. H. Corner s.n. (paratype, L, watercolor only), xii.1940 E. J. H. Corner s.n. (paratype, L, watercolor only); Botanic Gardens, 18.viii.1940 (paratype, L, watercolor only). |
| discussion |
from protolog: "Amanita demissa seems to possess all the characters of a small species of section Amanita, viz. a hollow stipe, a striate margin of the pileus and a narrow non-striate annulus. However, the spores are amyloid and therefore the species has to be placed in section Validae where it does not find close allies."
The present species was also recorded (but not collected) by Corner from "Mandai Rd. forest," Singapore.
Beeli described a central African specimen with dark pigmentation, a distinctly striate pileus margin, and amyloid spores—A. fuliginosa. A comparison of that species and the present one may be of interest. |
| citations |
—R. E. Tulloss |
| editors |
RET |
|
Spore data sets and their composite