name | Amanita coacta |
name status | nomen acceptum |
author | Bas |
english name | "Felted Volva Ringless Amanita" |
images |
1. Amanita coacta, Parque Estadual das Fontes do Ipiranga, São Paulo, São Paulo State, Brazil. 2. Amanita coacta, close up of typical felted thick warts, Parque Estadual das Fontes do Ipiranga, São Paulo, São Paulo State, Brazil. 4. Amanita coacta, Parque Estadual das Fontes do Ipiranga, São Paulo, São Paulo State, Brazil. 7. Amanita coacta, stipe base and typical volval arrangement, Parque Estadual das Fontes do Ipiranga, São Paulo, São Paulo State, Brazil. |
intro |
This description is taken from the original description of Bas (1978). |
cap |
The cap of A. coacta is 40 mm wide, umber in the center and pallid in marginal grooves, concave with or without a very slight umbo, with a sulcate-striate margin (extending to 50% of the radius). The volva is present as a few irregularly shaped, paler gray-brown felted, thin patches around the center of the cap. |
gills |
The gills are free, crowded, fairly broad, and white. The short gills are very scarce and truncate. |
stem |
The stem is 70 × 3 mm, tapering upward, without a bulb, exannulate, and white. The flesh is white and unchanging. The volva is up to 10 mm high at the base of the stem and felted-submembranous. |
odor/taste | Odor and taste were not described for this species. |
spores |
The spores measure 8.5 - 10.0 × 6.5 - 7.5 µm, and are broadly ellipsoid to ellipsoid. Clamps are absent at the bases of basidia. |
discussion |
This species was originally described from material collected in secondary rain forest (Manaus, Amazonas, Brazil) by Dr. Rolf Singer.—R. E. Tulloss & L. Possiel |
brief editors | RET |
name | Amanita coacta | ||||||||
author | Bas. 1978. Persoonia 10: 15, figs. 25-28. | ||||||||
name status | nomen acceptum | ||||||||
english name | "Felted Volva Ringless Amanita" | ||||||||
synonyms |
=Amanita crebresulcata sensu Pegler. 1997. Agarics São Paulo, Brazil: ??. The editors of this site owe a great debt to Dr. Cornelis Bas whose famous cigar box files of Amanita nomenclatural information gathered over three or more decades were made available to RET for computerization and make up the lion's share of the nomenclatural information presented on this site. | ||||||||
MycoBank nos. | 308546 | ||||||||
GenBank nos. |
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holotypes | INPA; isotype, L | ||||||||
revisions | Menolli et al. 2009. Mycotaxon 107: 419–430. | ||||||||
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 from the protolog. The basidiomes are small and slender. | ||||||||
pileus | ca. 40 mm wide, umber (except pallid in striations), matte in dried state ("then under strong lens with fibrillose structure only visible on dark marginal ridges"), concave with or without a very slight umbo; context not described; margin densely sulcate-striate (0.5R per field notes; 0.25-0.45R in exsiccata), with 12-14 striations per 10 mm arc (measured at mid-striations); universal veil around center as few, irregularly shaped, paler gray-brown, felted, thin volval patches bearing very small darker warts on their surfaces ("under lens"). | ||||||||
lamellae | free, crowded, farily broad, white, proably with concolorous edge; lamellulae truncate, very scarce. | ||||||||
stipe | ca. 70 × 3 mm, tapering upward, white, in dried state (under strong lens) subflocculose; context white, unchanging; exannulate; universal veil saccate, felted-submembranous, thin, up to ca. 10 mm high, more or less breaking up into felted, gray patches "with at their surface (under strong lens) appressed paler to nearly whitish short fibrils." | ||||||||
odor/taste | Odor lacking. Taste not recorded. | ||||||||
macrochemical tests |
none recorded. | ||||||||
basidia | [10/1/1] 32 - 45 × 10.5 - 11.5 μm, 4-sterigmate; clamps lacking. | ||||||||
basidiospores |
from protolog: [10/1/1] 8.5 - 10.0 × 6.5 - 7.5 μm, (Q = 1.25 - 1.40; Q = 1.30; Q' = 1.30), hyaline, colorless, thin-walled, inamyloid, broadly ellipsoid to ellipsoid; apiculus proportionately small; contents usually as single oil drop; color in deposit not recorded. type study of Wartchow (2010): [40/1/1] (6.5–) 7.5 – 10.0 (–10.5) × (4.5–) 5.5 – 7.5 (–8.0) μm, (L = 8.8 μm; W = 6.4 μm; Q = (1.24–) 1.28 – 1.47 (–1.50); Q = 1.36), hyaline, colorless, smooth, thin-walled, inamyloid, broadly ellipsoid to ellipsoid, adaxially flattened, with apex broadly rounded; apiculus proportionately small, sublateral; contents guttulate, difficult to observe; not recorded. non-type material revised by Wartchow (2010): [142/5/4] (7.5–) 8.0 – 10.0 (–11.0) × (5.5–) 6.0 – 7.0 (–7.5) μm, (L = 8.7 – 9.1 (–9.4) μm; L’ = 8.9 μm; W = 6.5 – 7.0 μm W’ = 6.7 μm; Q = (1.14–) 1.18 – 1.56 (–1.69); Q = (1.28–) 1.31 – 1.37; Q’ = 1.33), hyaline, colorless, smooth, thin-walled, inamyloid, broadly ellipsoid to ellipsoid, infrequently elongate, adaxially flattened; apiculus sublateral to subapical; contents guttulate; color in deposit not recorded. | ||||||||
ecology | Solitary. Brazil: Terrestrial in secondary tropical rain forest with all accompanying trees and shrubs reported as non-ectotrophic with the exception of Neea and Psychotria. | ||||||||
material examined |
from protolog: BRAZIL: AMAZONAS—Manaus, on grounds of INPA, 27.v.1977 R. Singer B9728 (holotype, INPA 66.714; isotype, L). Wartchow (2010): BRAZIL: AMAZONAS—Manaus, on grounds of INPA [3°05'44.94" S/ 59°59'16.07" W], 27.v.1977 R. Singer B9728 (holotype, INPA 66.714; isotype, L). SÃO PAULO—São Paulo, Parque Estadual das Fontes do Ipiranga, 21.i.1987 D. Pegler 3810 (SP 214459), 19.xi.2002 M. Capelari & D. M. Vital MC4189 (SP 393670), 11.i.2007 F. Karstedt FK841 (SP 393677), 20.iv.2007 N. Menolli Jr. et al. NMJ126 (SP 393681). | ||||||||
citations | The recent revison by Menolli et al. (2009) is available as a PDF. (open)—R. E. Tulloss, F. Menolli | ||||||||
editors | RET | ||||||||
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name | Amanita coacta |
bottom links | [ Keys & Checklists ] |
name | Amanita coacta |
bottom links | [ Keys & Checklists ] |
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.