The cap of A. oblongispora is 65 - 80 mm wide,
campanulate at first, later planoconvex to planar, often
with a prominent and broad umbo, glabrous, moist and
lubricious at first to slightly viscid, then dry, with a
striate-sulcate margin (up to 7 mm or 10 - 20% of the
radius). The cap is light pearl gray, with disc
brown-ocher, darkening with age. The volva is absent or
as a large patch or patches, submembranous to membranous,
rather thick, white to off-white.
The gills are free, subdistant, white, orangish tan to grayish brown to
sordid tan in exsiccata, rather broad and thick. Short gills are present.
The stem is 80 - 150 × 6 -15 mm, cylindric to narrowing upward, subsmooth, white
to whitish above, exannulate, sometimes with rather pale
brown-bister fibrils in bands below. The flesh is white
to slight bister towards base, stuffed to hollow, quite
firm, but fragile and quick to decay. The small, cup-like
volva or fragile, saccate volva is white to ochraceous,
friable to submembranous, extending up to 30 mm up stem,
not easily removed from substrate.
The spores measure (8.2-) 10.5 - 13.8 (-16.2) × (7.2-) 7.8 - 10.8 (-13.5) µm and
are inamyloid and broadly ellipsoid to ellipsoid (occasionally elongate, infrequently cylindric). Clamps
are rather common at bases of the basidia.
This species was originally described from Italy (Sardinia) and is still known only
from this region.
This species seems to be rather
isolated if my observation of clamped basidia is correct.
Taxa with broadly ellipsoid to ellipsoid spores and weak
or relatively weak volvas include taxa similar to A. malleata (Piane ex Bon)
Contu on the one hand and taxa similar to A. mairei Foley
on the other. At the moment, I believe the relationship of A. oblongispora is closer to the
first of these groups; however, this observation still
fails to place A. oblongispora definitively.
Obviously, work remains to be done in these groups.—R. E. Tulloss
("oblongospora") Contu ex Tulloss & Contu in Tulloss. 1994. Mycotaxon 52: 358, figs. 33-34.
"Contu's Ringless Amanita"
≡Amanita oblongospora Contu nom. inval.1988. Bol. Soc. Micol. Madrid 12: 90. [All requirements for valid publication were met except that a type was not specified, although the herbarium in which it is deposited was mentioned. ICBN §37.1, §37.3.]
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.
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.
Consiglio. 2000. Boll. Gruppo Micol. G. Bresadola 43(2): 225.
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
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 of the present species.
from protolog: [160/7/4] (8.2-) 10.5 - 13.8 (-16.2) × (7.2-) 7.8 - 10.8 (-13.5) µm, (L = 11.5 - 12.6 µm; L' = 12.1 μm; W = 8.5 - 10.1 µm; W' = 9.2 μm; Q= (1.07-) 1.14 - 1.59 (-2.16); Q = 1.19 - 1.45; Q' = 1.33), hyaline, colorless, thin-walled, smooth, inamyloid, broadly ellipsoid to ellipsoid, occasionally elongate, infrequently cylindric, occasionally subventricose to ovoid, often adaxially flattened; apiculus sublateral, cylindric, broad at times; contents granular to mono- to multiguttulate; white in desposit.
from holotype only (RET): [40/1/1] (8.2-) 10.2 - 14.0 (-16.2) × (7.2-) 7.5 - 9.5 (-10.0) µm, (L = 12.2 µm; W = 8.5 µm; Q= (1.14-) 1.20 - 1.73 (-2.16); Q = 1.45). [Note: Spore measurements for the holotype are segregated because I have come to think that one or more of the paratypes may have to be excluded from the species.—RET]
from protolog: Infrequent. Under mixed broad-leaved trees including Quercus spp. in humicolous acid soil.
from protolog: ITALY: SARDINIA—Prov. Cagliari - "la Cannoneris" St. For., Punta Sebera, 25.x.1986 M. Contu 86 10 25/05 (holotype, CAG). Prov. Nuoro - Laconi, 20.vi.1992 M. Contu 92/37 (paratype, CAG), 92/38 (paratype, CAG; paratype, RET, fragments), 92/43 (paratype, CAG).
—R. E. Tulloss
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