The cap of A. tanzanica is 50 - 110 mm wide, first convex, becoming flat, silky, sticky, smooth, with a striate margin. The cap is bright orange to dark orange, becoming paler and having more of an ochre tint with age. The flesh is fairly firm. The volva is seldom present on the cap; and, in such cases, it is present as one or a few big, white patches.
The gills are free, white, fairly crowded, thin, with a smooth margin.
The stem is 80 - 130 × 5 - 20 mm, white, with a finely striate ring above, and slightly floccose below. The flesh is white, brittle fibrous, and later hollow. The saccate volva is attached at the very bottom of the stem, white to dirty white, big, lobed, and thick.
The odor is reportedly "weakly of earth," and the taste said to be "mild" and "pleasant."
The spores from an isotype measure (8.5-) 9.0 - 11.4 (-12.6) × (5.0-) 5.5 - 6.7 (-7.8) µm, and are elongate to ellipsoid, infrequently cylindric, and inamyloid. Clamps are occasional or not frequent at the bases of basidia ("mostly without, but occasionally with, clamps" according to the original description). Lack of clamps is very unusual in sect. Caesareae, and the material should be re-examined.
The species was originally described from miombo woodland in Tanzania. Some associated plant genera are listed: Albizia, Brachystegia, Diospyros, Diplorhynchus, Pterocarpus, and Xeroderris.
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H; isotype, DSM
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Much of the macroscopic and ecological descriptions are based on the protolog of this present species. The remainder is based upon original research of R. E. Tulloss.
from protolog: 50 - 110 mm wide, bright to dark orange at first, becoming paler and developing ochraceous tint with age, convex becoming planar, lacking umbo, smooth, sticky; context white except yellowish under pileipellis, fairly firm; margin striate (0.2± R), nonappendiculate; universal veil infreqently present as one or two white patches.
from protolog: free with decurrent lines on stipe, fairly crowded, white, 5 - 9 mm broad, fairly thin, with smooth and concolorous edge; lamellulae undescribed.
from protolog: 80 - 130 × (5-) 10 - 15 (-20) mm, white, cylindric, but extreme base slightly attenuate, finely striate above annulus, slightly floccose below; context white, brittle, fibrous, becoming hollow, with floccose material in central cylinder; partial veil superior, white, membranous, thin, pendent, finely striate above; universal veil as robust saccate volva, membranous, white to dirty white, lobed, thick, with slightly floccose exterior surface (occasionally breaking up into ochraceous patches), attached to extreme base of stipe, with small limbus internus.
from protolog: Odor weakly of earth. Taste mild, pleasant.
from protolog: in two layers, with gelatinized suprapellis; filamentous hyphae 2 - 5 μm wide; vascular hyphae up to 10 μm wide, conspicuous, "penetrating surface tissue"; clamps occasional. [Note: Probably the vascular hyphae cross between the pileus context and the pileipellis; but it is possible that the authors were describing vascular hyphae restricted to the pileipellis that cross between the subpellis and suprapellis without experiencing gelatinization. Neither of these cases would be unusual in Amanita.—ed.]
from protolog: bilateral.
from protolog: inflated cells irregularly subglobose to angular, 5 - 15 μm wide. [Note: Subhymenium in illustration appears not to be fully rehydrated.—ed.]
from protolog: 30 - 45 × 9 - 13 μm, 4-sterigmate; clamps not reported.
from protolog: On pileus: not described. On stipe base: ?.
from protolog: longitudinally acrophysalidic; filamentous hyphae 4 - 7 μm; acrophysalides small at surface, below surface up to 150 × 50 μm; vascular hyphae up to 15 μm wide found throughout; clamps "occasional." [Note: The fact that the hyphae "inside" the stem are described as flexuous and loose and (apparently) not having longitudinal orientation suggests that authors were examining the material in the central cylinder of the stipe rather than the context proper; hence, the size of the acrophysalides may apply only to the "stuffing" material. A revision of the stipe context will be necessary.—ed.]
from protolog: sterile; sterile; filamentous hyphae in loosely interwoven cable-like structure (per figure); inflated cells30 - 70 μm long, "cystidia-like," clavate to broadly clavate to irregularly (subsinuate) clavate and terminal singly (both per figure).
from protolog: [-/-/-] 8.5- 12.5 × 5.5 - 8 μm, (L' = 10.4 μm; W' = 6.6 μm; Q = 1.48 - 1.72; Q' = 1.58), hyaline, smooth, inamyloid, ellipsoid to elongate; apiculus sublateral (per illustration); contents usually mono-, sometimes multiguttulate; white in deposit. [Note: The sporograph for this data is greatly extended in length and width, possibly because the ranges provided in the protolog are not of a form compatible with the standard on this site. The reader may wish to use the ?User+sporograph page to manually delete the protolog data when comparing spores of this species with other taxa.—ed.]
from type study of RET: from type: [40/1/1] (8.5-) 9.0 - 11.4 (-12.6) × (5.0-) 5.5 - 6.7 (-7.8) µm, (L = 10.4 µm; W’ =
6.0 µm; Q = (1.42-) 1.50 - 1.93 (-2.02); Q = 1.72), hyaline, colorless, thin-walled, smooth, inamyloid, ellipsoid to elongate,infrequently cylindric, often not strongly adaxially flattened, sometimes swollen at one end; apiculus sublateral, cylindric; contents mono- to multiguttulate, with or without small additional granules; white in deposit.
from protolog: Subgregarious, at 300 - 1650 m elev., in miombo woodland with several mycorrhizal trees, with Brachystegia, Uapaca, and Parinari being the most commonly present. In miombo woodland with Brachystegia, Pterocarpus, Xeroderris, Diospyros, Diplorhynchus, and Albizia or in field under Anacardium or in brown soil of miombo woodland with Uapaca, Syzygium, Terminalia, and Parinari or in miombo woodland with main trees Uapaca and Faurea and some Parinari or in red soil of hill slope in degraded miombo woodland with Brachystegia, Julbernardia, Uapaca, Syzygium, and Combretum or in Brachystegia-Uapaca woodland with Ochna, Parinari, Rothmannia, Combretum molle R. Br. ex G. Don., Garcinia, and Gardenia or by river, in red soil of degraded Uapaca woodland with few Brachystegia, Garcinia, Eriosema, Ochna, Faurea, Bridelia, and Protea or in heavily grazed and degraded Uapaca-Brachystegia woodland.
from protolog: TANZANIA: SOUTHERN PROV.—Masasi Distr. - 60 km SW of Masasi, Kigweje village [10 38 CD], 24.i.1993 Saarimäki et al. 1375 (paratype, DSM; paratype, H). Songea Distr. - 29 km from Songea twd. Mbinga, Matomondo [10 35 BC], 29.i.1993 Saarimäki et al. 1442 (paratype, DSM; paratype, H 7002986); 40 km N of Songea, Hanga, Nyamagoma village [10 35 BC], 27.i.1993 Saarimäki et al. 1431 (paratype, DSM; paratype, H); ca. Namtumbo, Mambura village [10 36 AC], 26.i.1993 Saarimäki et al. 1403 (paratype, DSM; paratype, H 7002990). Tunduru Distr. - 18 km W of Tunduru [10 37 CC], 25.i.1993 Saarimäki et al. 1385 (paratype, DSM; paratype, H7002983), 1388 (holotype, H; isotype, DSM); 114 km W of Tunduru, highest pt. along main rd. [10 36 DA], 25.i.1993 Saarimäki et al. 1394 (paratype, DSM; paratype, H); Kingulungulu village [10 37 CD], on rd. to Tunduru [purchased from woman on way to market], 24.i.1993 Saarimäki et al. 1378 (paratype, DSM; paratype, H). SOUTHERN HIGHLANDS PROV.—Njombe Distr. - 2 km N of Kidugala, Ngaramiro [09 34 BA], 31.i.1993 Saarimäki et al. 1483 (paratype, DSM; paratype, H); 11 km S of Kidugala, Mbalali village [09 34 BA], 1.ii.1993 Saarimäki et al. 1501; N of Kidugala, btwn. Sengele and Masaulwa villages [09 34 BA], 2.ii.1993 Saarimäki et al. 1526 (paratype, DSM; paratype, H 7002992). [Note: Six-character location codes given above are those of Polhill (1988) and Leistner and Morris (1976) per Härkönen et al. (1994).]
from type study of RET: TANZANIA: SOUTHERN PROV.—Tunduru Distr. - 18 km W of Tunduru [10 37 CC], 25.i.1993 Saarimäki et al. 1388 (holotype, H 7002982; isotype, DSM).
Comparison by sporographs of the present species to two other African taxa of similar macro- and micromorphology and to the somewhat similar south Asian species A. hemibapha follow:
—R. E. Tulloss
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