| name | Amanita parviformis |
| name status | nomen acceptum |
| author | (Murrill) Murrill |
| english name | "Small Destroying Angel" |
| intro | The following description is based on Murrill (1945c), with the addition of my observations of the type. RET would like to make it clear at the outset that this species is very difficult to separate from A. elliptosperma. The possibility of synonymy is very real. |
| cap | The cap of Amanita parviformis is 25 mm wide, hemispheric, not fully expanding, slightly viscid when fresh, smooth, glabrous, subshining, white, unchanging, with a entire even margin. The flesh is thin except at the center, white, unchanging. |
| gills | The gills are adnate, crowded, medium broad, entire, white, unchanging. |
| stem | The stem is about 30 × 5 - 8 mm, narrowing upward, smooth, glabrous, white, unchanging when bruised. The ring is fixed 10 mm from the top of the stem, very short, skirt-like, grooved by the gills above, white, persistent. The bulb is ovoid, white, 20 × 15 mm. The volva is neither appressed nor widely spreading, the edge is either 3-lobed or ragged. |
| odor/taste | The mushroom is odorless. |
| spores | The spores of the type measure (8.2-) 8.8 - 10.0 (-11.2) × (5.2-) 5.5 - 7.0 (-7.2) µm and are ellipsoid to elongate, occasionally broadly ellipsoid and amyloid. Clamps are absent at bases of basidia. |
| discussion |
Originally described from Florida in the sandy soil in the midst of wetlands, probably with oak. The name of this species suggests there would be value in a comparison to A. parva (Murrill) Murrill, a species with much more elongate spores placed by Bas (1969) in his subsect. Limbatulae of Amanita sect. Lepidella. This is one of the taxa that is extremely close to Amanita elliptosperma G. F. Atk. and the name of which could well be placed in synonymy with the name of the latter. See the discussion of A. elliptosperma in the key to species of sect. Phalloideae in Central and North America.—R. E. Tulloss |
| brief editors | RET |
| name | Amanita parviformis | ||||||||||||||||||||
| author | (Murrill) Murrill. 1945c. Lloydia 7(4): 327. | ||||||||||||||||||||
| name status | nomen acceptum | ||||||||||||||||||||
| english name | "Small Destroying Angel" | ||||||||||||||||||||
| synonyms |
≡Venenarius parviformis Murrill. 1945c. Lloydia 7(4): 315. 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. | 284067 | ||||||||||||||||||||
| GenBank nos. |
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| holotypes | FLAS F19266 | ||||||||||||||||||||
| type studies |
Jenkins. 1979. Mycotaxon 10: 185. Tulloss (here) | ||||||||||||||||||||
| 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 not directly from the protolog of the present taxon and not cited as the work of another researcher is based on original research by R. E. Tulloss. | ||||||||||||||||||||
| basidiospores |
from type study of Jenkins (1979): [-/-/1]
7.8 - 9.4 × 5.5 - 6.3 μm, (Q = 1.24 - 1.54; Q' = 1.40),
hyaline, thin-walled, amyloid, broadly ellipsoid to ellipsoid, often adaxially flattened; apiculus sublateral, short cylindric; contents guttulate;
color in deposit not recorded. from type study of RET: [39/1/1] (8.2-) 8.8 - 10.0 (-11.2) × (5.2-) 5.5 - 7.0 (-7.2) μm, (L = 9.4 μm; W = 6.3 μm; Q = (1.21-) 1.32 - 1.67 (-1.88); Q = 1.49), hyaline, colorless, smooth, thin-walled, amyloid, ellipsoid, occasionally elongate, infrequently subglobose, often adaxially flattened, sometimes swollen at one end; apiculus sublateral, cylindric to truncate-conic; contents guttulate; ?? in deposit. | ||||||||||||||||||||
| ecology | In "high hammock" [a relatively limited elevated forested area in the midst of lower, rather wet forest of different composition]. | ||||||||||||||||||||
| material examined |
from type study of Jenkins (1979): U.S.A.: FLORIDA—Alachua Co. - Gainesville, 4.x.1943 W. A. Murrill F 19266 (holotype, FLAS). from type study of RET: U.S.A.: FLORIDA—Alachua Co. - Gainesville, 4.x.1943 W. A. Murrill F 19266 (holotype, FLAS). | ||||||||||||||||||||
| discussion |
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| citations | —R. E. Tulloss | ||||||||||||||||||||
| editors | RET | ||||||||||||||||||||
Information to support the viewer in reading the content of "technical" tabs can be found here.
| name | Amanita parviformis |
| bottom links | [ Keys & Checklists ] |
| name | Amanita parviformis |
| bottom links | [ Keys & Checklists ] |
Spore data sets and their composite
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.
Text and User-Generated Sporographs are published under the Creative Commons License.
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