Amanita stranella

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name	Amanita stranella
name status	insufficiently known
author	E.-J. Gilbert & Snell
english name	"Little Straw-Colored Amanita"
intro	The following is derived from the original description and from examination of original material of the species by RET.
cap	The cap of A. stranella is 35 - 60 mm wide, citron straw-colored to saturated cream, straw colored in the center, whitish at the margin, broadly bell-shaped, then broadly expanded, slightly depressed in the center with a slight umbo, and viscid when wet. It has a slightly striate margin. The flesh is thin and white.
gills	The gills are narrowly adnate, narrowing towards both ends, not very broad, and white. Short gills are not described.
stem	The stem is 85 - 160 × 6 - 12 mm, narrowing upward, subsquamulose above the bulb, and hollow. The bulb is globose, about 17 - 30 mm thick, and marginate. The ring is membranous, fragile but persistent. The volva is present on the bulb as a broken, narrow, membranous, white, marginal limb.
spores	The spores are said too measure 8 - 10 μm in diameter and are globose and inamyloid. Spore drawings of Gilbert (1940) are not oriented appropriately for measurement with one exception [8.8 (-10) × 8.3 μm].
discussion	This taxon was originally described from a forest of Pine and Eastern Hemlock in the Adirondack Mountains of New York. This species is known only from the original description, however it is described sufficiently well to be separated from Amanita albocreata G. F. Atk. which entirely lacks a ring, has pronounced marginal striations on the cap, and has an ocreate (rolled sock) type of volva on the top of its bulb. The species' authors thought it might be confounded with Amanita citrina in the sense of American authors, but the latter has amyloid spores and lacks a striate cap margin. Color and habit of the fresh mushroom were based on a watercolor and not on fresh material.—R. E. Tulloss and L. Possiel
brief editors	RET

name

Amanita stranella

author

E.-J. Gilbert & Snell in E. J. Gilbert. 1941. Iconogr. Mycol. 27, suppl. 1 (2/3): 250.

name status

insufficiently known

english name

"Little Straw-Colored Amanita"

synonyms

≡Ariella stranella (E.-J. Gilbert & Snell) E.-J. Gilbert nom. inval. 1940. Iconogr. Mycol. 27, suppl. 1(1): 76, 100, tab. X(fig. 6). [Basionym did not exist, nom. nud.]

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.

284075, 284222

GenBank nos.

Due to delays in data processing at GenBank, some accession numbers may lead to unreleased (pending) pages. These pages will eventually be made live, so try again later.

accession	locus	voucher	source



No data available in table

holotypes

in herb. E.-J. Gilbert (lost)

type studies

Tulloss (herein)

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 based on the protolog of the present species and original research of R. E. Tulloss.

pileus

from protolog: 35 - 60 mm wide, citrine-straw colored, saturated cream over disc, whitish at margin, campanulate-convex, then expanded, slightly depressed over disc and more or less umbonate, viscid when moist; context white, thin, thickened in disc; margin striate upon exposure; universal veil not described.

lamellae

from protolog: free with narrow projection ("claw"), density not described, white, narrowed toward both ends, "not very broad"; lamellulae not described.

stipe

from protolog: 85 - 160 × 6 - 12 mm, color not given, narrowing upward, subsquamulose near base; bulb globose, 17 - 30 mm wide; context becoming hollow; partial veil membranous, fragile, persisting; universal veil "apparently" as lacerate-circumcissile free limb, white, membranous, "more or less thin."

odor/taste

neither recorded.

macrochemical
tests

none recorded.

pileipellis

not described.

pileus context

not described.

lamella trama

not described.

subhymenium

not described.

basidia

not described.

universal veil

not described.

stipe context

not described.

partial veil

not described.

lamella edge tissue

sterile.

basidiospores

send to graphing tool

from protolog: [1/1/1] 8.8 × 8.3 μm, (Q = 1.06) hyaline, smooth, inamyloid, subglobose; apiculus sublateral and subcylindric to truncate-conic (all per figure); contents not described; white in deposit. [Note: Spore data derived from image of single spore in lateral view (Gilbert 1940: tab. X(fig. 6)) Without ranges of length, width, and Q, no sporograph can be generated.—ed.]

from only known original material (RET): [20/1/1] (7.1-) 7.5 - 8.5 (-9.0) × 6.3 - 8.0 (-8.5) μm, (L = 8.0 μm; W = 7.2 μm; Q = (1.03-) 1.06 - 1.22); Q = 1.12), hyaline, colorless, smooth, thin-walled, inamyloid, subglobose to broadly ellipsoid (infrequently globose), adaxially flattened; apiculus sublateral, cylindric; contents granular to multiguttulate; color in deposit not recorded.

ecology

from protolog: In forest of Pinus and Tsuga canadensis.

from only known original material (RET): Under P. strobus and Tsuga canadensis.

material examined

from protolog: U.S.A.: NEW YORK—Warren Co. - Warrensburg, Adirondack Mtns., 9.vii.1935 W. H. Snell s.n. (holotype, in herb. E.-J. Gilbert, lost).

from revision of only known original material (RET): U.S.A.: RHODE ISLAND—Providence Co. - Riverside, 27.vii.1937 W. H. Snell 1541 (syntype, KIRI => RET unaccessioned). [Note: There are many localities named "Riverside" in northeastern North America. RET suggests that this "Riverside" is the one quite close to Brown University where Dr. Snell studied and then taught for many years until his retirement in 1959.—ed.]

discussion

The holotype of this species is undoubtedly lost with the herbarium of E.-J. Gilbert. The only original material known to RET was deposited on permanent loan from KIRI in RET's herbarium, when KIRI was closed. A search for authentic material using the specimen search of all herbaria associated with Mycoportal resulted in no additional material being found.

Considering the brevity of the original description of A. stranella, the fact that the description of its coloration was based on a watercolor (a “croquis colorié” deposited with the type), the loss of the holotype and accompanying watercolor, and the absence of any reference to material other than the type in the protolog, we cannot know if the single extant basidiome that can be classified as original material (for which no annotation or illustration is known to exist) is contaxic with the lost type. Nevertheless, we are permitted by the ICBN to designate Snell 1541 as the lectotype under the above conditions.

There would be no practical significance to doing such a thing unless, the name of Gilbert and Snell thus (re)defined can then be identified with a body of well-annotated and well-preserved collections. This latter seems to be the challenge. Among described and provisional taxa with a more or less ocreate volva from the region of interest, there are few possibilities.

The annulate stipe in the present species excludes the possibility that name is a synonym of A. albocreata, the stipe of which is exannulate from the first. Moreover, the cap of the latter species is Maize Yellow over the disc and white elsewhere and has long marginal striations.

Of the known and provisional taxa placed for the present in Amanita subsect. Pantherinae, the most similar is Amanita praecox. A sporograph comparison of the two taxa follows:

The sporograph for KIRI 1541 (A. stranella) is consistent with the assumption that it is based on spores from an old and poorly preserved basidiome of the same taxon as the recently collected material (A. praecox).

The two taxa occur in similar forests in the earlier part of their region's season for fruiting of gilled fungi. Both have a fragile partial veil and a volval limb that encloses the stipe's base.

Although it may prove difficult or impossible to do, an effort should be made to extract DNA from the known authentic stranella collection and to derive a useful sequence, sequences or sequence fragments therefrom.

...more t.b.d. ...

citations

—R. E. Tulloss

editors

RET

Information to support the viewer in reading the content of "technical" tabs can be found here.

name	Amanita stranella
name status	insufficiently known
author	E.-J. Gilbert & Snell
english name	"Little Straw-Colored Amanita"

name	Amanita stranella

name	Amanita stranella

Spore data for collections
provisionally identified as: Amanita stranella E.-J. Gilbert & Snell

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.

basidiospore definition

Spore Measurements by Collection

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infraspecific taxa of pantherina2

Spore Measurements by Collection

infraspecific taxa of pantherina
2