name | Amanita sp-54 |
name status | cryptonomen temporarium |
author | Tulloss & Rodríguez Caycedo |
images | |
cap | The unevenly pigmented cap of Amanita sp-54 is 50 - 63 mm and predominantly gray-brown (darkest over disc); sometimes it appears coarsely streaky. At first it is subhemispheric; when expanded it can be irregularly planoconcave and, sometimes, depressed in the middle at maturity. Oddly, for species of sect. Validae, the cap margin is unevenly striate even when immature (at least in the few specimens seen so far). No volval warts or patches have been seen on the cap. |
gills | The gills are free to receding with occasional short decurrent tooth and crowded. They are pale cream in mass and off-white in side view and unchanging when cut or bruised. Short gills are rounded or more or less smoothly narrowing on the inner ends. There is at least one between every pair of regular gills. |
stem | The approximately cylindric stem is 77 - 92 × 8 - 8.5 mm long. It is whitish to pale cream and unchanging. The stem barely flares at its top in mature specimens. The bulb is barely broader than the stem and is sometimes dog-legged; it can be short or long and root-like. The stem is stuffed densely with white fibers; larval tunnels were not observed. The skirt-like ring is high on the stem, thin, membranous, white to cream above, yellowish below, with a band of yellow at the edge on the bottom. The crumbling yellow volva is present on the lower stem and upper bulb as patches or small warts that may be easily lost in collecting. |
odor/taste | The odor is indistinct. |
spores | Spores of this species measure (6.0-) 7.0 - 7.8 (-8.0) × (4.0-) 4.5 - 5.5 (-5.6) μm and are ellipsoid (infrequently elongate) and amyloid. Clamps are not present on basidia. |
discussion |
So far, this species is only known from one site in New Jersey where a pair of mushrooms was found under Norway Spruce at a short distance from White Pine during an extraordinarily rainy August. Amanita sp-54 is generally similar to A. flavoconia: however, it has the very unusual trait in sect. Validae of having a striate cap margin. In addition, the streaky gray-brown cap, yellow volva, very small spores and deeply rooting stem base are important diagnostic characters. There is a common undescribed species of sect. Vaginatae which is extremely similar when viewed from above.—R. E. and M. A. Tulloss and C. Rodríguez Caycedo |
brief editors | RET |
name | Amanita sp-54 | ||||||||||||||||||||
name status | cryptonomen temporarium | ||||||||||||||||||||
GenBank nos. |
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intro |
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 based on original research of R. E. Tulloss and C. Rodríguez Caycedo. | ||||||||||||||||||||
pileus | 50 - 63 mm, unevenly pigmented, predominantly gray-brown, darker over disc, with margin slightly darker than 5D3 and disc 5E-F4, virgate or more coarsely streaky, subhemispheric to irregularly planoconcave, sometimes centrally depressed at maturity, tacky, dull; context pale cream, except gray between stipe apex and pileipellus, unchanging, 2.5 - 4 mm thick above stipe, thinning evenly for 75 - 80% of cap radius then membranous to margin; margin unevenly striate (0.2-0.4R) even when immature, nonappendiculate; universal veil absent. | ||||||||||||||||||||
lamellae | Free to receding with occasional short decurrent tooth, crowded, pale cream in mass, off-white in side view, unchanging, 4 - 7 mm broad, broadest at about 80% of length from stipe; lamellulae rounded truncate, subattenuate, attenuate, attenuate in steps, evenly distributed (at least one between every pair of lamellulae), of diverse lengths. | ||||||||||||||||||||
stipe | 77 - 92 × 8 - 8.5 mm, whitish to pale cream, unchanging, narrowing upward or cylindric, barely flaring at apex in mature specimen, faintly longitudinally striatulate; bulb barely broader than stipe, as short to extended radical, 11.5 - 33+ × 8.5 - 9.5 mm, sometimes dog-legged; context stuffed, off-white, unchanging, with central cylinder 1.5 - 2.5 mm wide, with stuffing comprising dense longitudinally oriented white fibers, with obconic lacuna just below pileus context, with larval tunnels not observed; partial veil superior, thin, membranous, white to cream above, yellowish below, with band of yellow at edge on undersurface; universal veil as patches or crumb-like fragments, rather bright yellow, friable, detersile. | ||||||||||||||||||||
odor/taste | Odor indistinct. Taste not recorded | ||||||||||||||||||||
macrochemical tests |
none recorded. | ||||||||||||||||||||
basidiospores | [20/1/1] (6.0-) 7.0 - 7.8 (-8.0) × (4.0-) 4.5 - 5.5 (-5.6) μm, (L = 7.4 μm; L' = 7.4 μm; W = 5.0 μm; W' = 5.0 μm; Q = (1.36-) 1.38 - 1.60 (-1.64); Q = 1.49; Q' = 1.49), hyaline, colorless, smooth, thin-walled, amyloid, ellipsoid ,infrequently elongate, adaxially flattened; apiculus sublateral, cyclindric; contents monoguttulate, with or without granules; white in deposit. | ||||||||||||||||||||
ecology |
Indiana: In hardwood forest. New Jersey: Paired. At 43 m elev. In sandy loam
under Picea abies with Pinus strobus at
15-20 m distance with Quercus at 50 m or more
distance. The original collection (RET 503-9) was made during a period of extraordinary rainfall. | ||||||||||||||||||||
material examined | U.S.A.: INDIANA—Monroe Co. - Burlington, Griffey Lk., 8.vi.2012 Stephen Roberts s.n. [mushroomobserver #96720] (RET 503-9, nrITS seq'd.). NEW JERSEY—Monmouth Co. - Roosevelt, Farm Lane [40°13'01" N/ 74°28'16" W, 43 m], 26.viii.2011 M. K. & R. E. Tulloss 8-26-11-A (RET 487-6, nrITS seq'd.). TEXAS—Unkn. Co. - Big Thicket Nat. Preserve, Turkey Creek Unit, Gore Rd. Tr. [30.5078° N/ 94.3506° W, 33 m], 7.vi.2019 Ron Pastorino 6-7-19F [mushroomobserver #371463] (RET 868-4, nrITS-LSU seq'd.). | ||||||||||||||||||||
discussion |
The most curious characteristic of the present species is the occurence of marked marginal striations on incompletely opened (hemispheric) pilei before the start of sporulation. If this trait is found consistently in future collections, this species will be the only one in sect. Validae known from North America to have this characteristic. With the exception of the above trait, A. sp-54 is similar to taxa such as A. elongata and A. flavoconia. As shown in the following illustration, A. sp-54 has spores that are distinctively smaller than those of the other two named species. | ||||||||||||||||||||
citations | —R. E. Tulloss and C. Rodríguez Caycedo | ||||||||||||||||||||
editors | RET | ||||||||||||||||||||
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