14.i.2002 L. Grubisha 864 (UCB ?? as "A. muscaria var. formosa" and "AM21" in (Geml et al. 2008))
J. Geml et al. (2008), Molecular Microbial Ecology Lab., Univ. Alaska, Anchorage
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 RET, J. Geml, and L. Grubisha.
60 - 70 mm wide, yellow to orange to yellow-orange, often with pinkish tints, convex then planar, ??; context yellow for a thickness of 5± mm below pileipellis, otherwise white; margin striate at maturity, at times bearing cottony white fragments of partial veil; universal veil as small patches or scales or warts, occasionally as thin subtranslucent patch over disc becoming warts or scales toward margin, whitish yellow at first, then white; pileipellis ?butter yellow in cross-section.
free to adnexed, ??, white, ??; lamellulae ??.
60 - 80 × 15 - 31 mm (length doesn’t?? includes bulb), cylindric or broadest at mid-point, fibrillose in concentric bands, ??; context firmly stuffed to partially
hollow (with lacuna or lacunae in central cylinder), white; bulb up to 39 × 25 mm; partial veil fragile, shredding, often detersile (at least in part); universal veil ??, limbate or ocreate,
0.5± mm or more thick, with free limb up to 10± mm high and attached near bulb apex, ??color??, firm, persistent, ??cannot read last line of notes on Grubisha 864??.
[30/1/1] (10.0-) 10.5 - 12.6 (-14.0) × 6.5 - 7.5 (-8.5) μm, (L = 11.6 μm; L’ = 11.6 μm; W = 7.1 μm; W’ = 7.1 μm; Q = (1.43-) 1.50 - 1.71 (-1.77); Q = 1.64; Q’ = 1.64), colorless, hyaline, smooth, thin-walled, inamyloid, ellipsoid to elongate, adaxially flattened, sometimes expanded at one end; apiculus sublateral, cylindric to truncate-conic; contents ??; probably white or whitish in deposit.
Solitary. With Quercus sp. (Fagaceae) and Arctostaphylos (Ericaceae) and other shrubs on hill top consisting largely of rock, with thick
organic layer of Lyonothamnus Gray below.
U.S.A.: CALIFORNIA—Sta. Barbara Co. - Channel Islands
Nat. Pk., Sta. Cruz Isl., “Ironwood RR” [??°??'??" N/ 119°45'00" W], 14.i.2002 L.
Grubisha 862 (UCB ??, as “A. muscaria var. formosa,” “AM20” in (Geml et al.
2008)), 864 (UCB ?? as “A. muscaria var. formosa,” “AM21” in (Geml et al.
The collections on which this taxon is based were collected during an ATBI of Santa
Cruz Island conducted by ??. The provisional diagnosis of the
material was A. muscaria var. formosa sensu auct. amer. (i.e., var. guessowii) because of the pileus coloration. However, the likelihood that the material represented an unnamed taxon was observed when the prelimary results of
sequencing were organized as a phylogenetic tree (Geml et al. 2008). The present taxon corresponds to clade VI of Geml et al. (2008: Fig. 1. In the phylogeny of Geml et al., the present taxon shares a common ancestor with A. muscaria var. persicina (clade III) and A. sp-LG1045 (clade V) and is basal in this grouping of similarly pigmented taxa.
Sporographs of the three species are compared in the following diagram:
The present species is known only from Santa Cruz Island.
—R. E. Tulloss, J. Geml, and L. Grubisha
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Tulloss, Geml & Grubisha
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