name | Amanita sp-CR14 |
name status | cryptonomen temporarium |
author | Tulloss and Halling |
images | |
intro | The following is based on original research of R.E. Tulloss. |
cap | The pale gray to pale brown cap has a darker rounded knob in the center and is 30-76 mm wide. The colors are darker in older specimens, and there is no staining or bruising reaction. The cap is planar to planoconvex. The cap's flesh is white, 1.5 - 4.5 mm thick, and thins evenly to the cap's edge. The edge is not grooved except in aged specimens and no volval remnants remain attached to the cap. |
gills | The crowded gills are free from the stem, and no downward line descends onto the upper stem; they are 2.5 - 4.5 mm broad. The short gills are plentiful and of diverse lengths. |
stem | The white, slightly longitudinally grooved stem is 76 - 119 × 3.5 - 8 mm, narrows upward, and flares at the top. The stem has no staining or bruising reaction. The bulb at the stem's base is 7 -19 x 10.5 - 19.5 mm and is flattened horizontally. The stem's white flesh is solid with a partially watersoaked central cylinder that is 1-2.5 mm wide. The white skirt-like ring is placed toward the top of the stem and is membranous; it collapses on the stem. Volval remnants are limbate as in Amanita bisporigera. |
odor/taste | A slight odor of decay is present in younger specimens. Taste was not recorded. |
discussion |
This little known entity has been collected at least twice
in Costa Rica. The collections were found growing by
themselves or paired at 1900 - 2400 m elevation in dark
wet loam of a forest with species of oak (Quercus
copeyensis, Q. seemannii and
Q. rapurahuensis) or in a mixed broad-leafed forest
with oak (Quercus seemannii dominant). This species has a very slender stem with a ring toward the top. Field notes distinguish this species from Amanita solaniolens (assignable to sect. Validae), which was collected on the same expedition to Costa Rica. Other field notes suggest comparisons with A. arocheae and A. eburnea. It appears to be a species of sect. Phalloideae.—R. E. Tulloss and N. Goldman |
brief editors | RET |
name | Amanita sp-CR14 | ||||||||
author | Tulloss and Halling | ||||||||
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. | ||||||||
pileus | 30 - 76 mm wide, very pale brownish gray, with umbo darker (although still pallid) gray to brownish gray, with all colors darker in oldest specimen, without staining or bruising reaction, planoconvex to planar, umbonate, with umbo more pronounced in age, viscid; context white, with watersoaked line at join with stipe context and over lamellae, entirely watersoaked in oldest specimen, 1.5 - 4.5 mm thick, thinning evenly to margin; margin nonstriate, except in age, nonappendiculate; universal veil absent from pileus. | ||||||||
lamellae | free. without decurrent line on stipe apex, crowded, off-white in mass, water-soaked white in side view, 2.5 - 4.5 mm broad, broadest somewhat toward the margin from midlength, rounded at margin; lamellulae subtruncate to subattenuate, unevenly distributed, of diverse lengths, plentiful. | ||||||||
stipe | 76 - 119 × 3.5 - 8 mm, white, without staining or bruising reaction, narrowing upward, flaring at apex, finely longitudinally striatulate; bulb 7 - 19 × 10.5 - 19.5 mm, subglobose, more or less longitudinally flattened; context white, neither staining nor bruising, solid, with partially watersoaked central cylinder 1 - 2.5 mm wide, with no larval tunnels observed; partial veil apical, white, thin, membranous, persistent, skirt-like, collapsing on stipe, not discoloring, without colored edge; universal veil limbate as in A. bisporigera. | ||||||||
odor/taste | Odor faintly of decay in youngest specimen. Taste not recorded. | ||||||||
macrochemical tests |
spot test for tyrosinase (paracresol) - after 5 min strong positive in upper part of bulb, positive in in spots on pileus context, stipe context and in limb on bulb; after 26 min. positive throughout bulb and attached limb, in irregular area below pileipellis in pileus context, and in irregular patch extending length of stipe mostly concentrated near stipe surface. spot test for laccase (syringaldazine) - negative throughout fruiting body. Test voucher: Tulloss 6-29-95-G. | ||||||||
lamella edge tissue | sterile; ??. | ||||||||
ecology | Solitary or paired. At 1900 - 2400 m elev. In dark wet loam of old open remnant forest occasionally used as pasture with Quercus copeyensis, Q. seemannii and Q. rapurahuensis or in mixed broadleafed forest with Q. seemannii dominant. | ||||||||
material examined | COSTA RICA: PROV. ALAJUELA—Ctn. Grecia - Grecia, Bosque del Niño [10°9’4” N/ 84°14’42” W, 1900 m], 29.vi.1995 Juber Torres & Juan Luis Mata s.n. [Tulloss 6-29-95-G] (RET 338-4). PROV. SAN JOSÉ—Ctn. Dota - La Chonta [9°41’58” N/ 83°56’31” W, 2400 m], 16.vi.1995 R. E. Tulloss 6-16-95-G (RET 331-8, nrITS seq'd.). | ||||||||
discussion | This species has a very slender stipe and an apical partial veil; it was not observed to have any yellow or olive tones on the basidiome. The field notes distinguish it from Amanita sp-CR18, which was collected on the same expedition. Other field notes suggest comparison with A. arocheae and A. eburnea. It seems to have suggested a species of sect. Phalloideae in the field. Nevertheless, perhaps because of the relative small size of the basidiomes of the two possible taxa, field notes take great pains to distinguish the present entity from A. sp-CR18. | ||||||||
citations | —R. E. Tulloss | ||||||||
editors | RET | ||||||||
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