description is based on the original description by Santiago, Cifuentes,
and Villegas (1984).
The cap of A. guzmanii is 70 - 130 mm wide, convex then planar, whitish, with
a striate margin. The cap is covered with easily removed powdery volva remains,
that is orange-brown and discolors to a pale sordid orange-brown. There
are also large, whitish, truncate, pyramidal to subcubic warts that are 3 - 5 mm
high and leave a mark on the cap when removed. The flesh is 6 - 8 mm thick over the stem and white.
The gills are free to lightly touching the
stem, crowded, white to pale cream, rather broad, with an edge decorated
with powder that is concolorous with the cap. The
short gills are truncate and numerous.
The stem is 95 - 210 × 15 - 25 mm, cylindric or narrowing upwards, with a whitish ground which is densely covered with powdery scales, concolorous with the cap volva and discoloring like the cap powder. The bulb is subglobose. The ring is membranous but fragile, skirt-like, whitish on the upper surface, concolorous with the volva on the lower surface.
The taste is slightly astringent.
Herrera-Fonseca and Guzmán-Dávalos (2002) reexamined the type of A. guzmanii and found the spores
dominantly broadly ellipsoid, occasionally subglobose and occasionally
ellipsoid and apparently found them to be smaller than they were described
originally. Unfortunately they did not publish the spore measurements that
they made. The spore measurements from the original description are (8.4-) 9.7 - 14.2 × 6.7
- 8.2 (-9) µm. They were said to be ellipsoid to elongate and inamyloid.
This species is originally described from the states of Guerrero and Michoacan, in Mexico where it occurs solitarily
or in groups in montane cloud forest (bosque mesófilo de montaña) of oak
(Quercus) or of oak and pine (Quercus-Pinus).
The original photograph of Amanita guzmanii,
when color corrected using Photoshop, appears to have the same coloring as A.
roseitincta (Murrill) Murrill. The difference in color stated in the original description of the present
species may be in error. We understand that Dra. Laura Guzmán-Dávalos and student(s) are pursuing the issue of possible synonymy of A. guzmanii and A. roseitincta—R. E. Tulloss and L. Possiel
Cifuentes, Villegas R. & G. Santiago in G. Santiago, Cifuentes & Villegas R. 1984. Bol. Soc. Mex. Micol. 19: 100, figs. 5-7, 8-12.
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The following material is derived from the protolog of the present species.
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lamella edge tissue
from protolog: [-/-/-] (8.4-) 9.7 - 14.2 × 6.7 - 8.2 (-9) μm, hyaline, smooth, thin-walled, inamylloid, ellpisoid; apiculus sublateral; contents not described; color in deposit not recorded. [Note: A sporograph is not generated because of the absence of a range for Q. This species is reportedly being re-examined (Guzmán-Davalos pers. comm.), and we are told that the spore data is going to differ from that provided in the protolog.—ed.]
from protolog: Solitary to subgregarious. At 1750 - 2700 m elev. In cloud forest dominated by Quercus or characterized by Pinus-Quercus mixture.
from protolog: MEXICO: GUERRERO—Mpio. Chichihualco, desviación a Atoyac, 16.viii.1980 J. Cifuentes s.n. (paratype, FCME 1484), 1.viii.1982 J. Cifuentes s.n. (paratype, FCME 10389), 6.viii.1982 Paz-Larralde s.n. (paratype, FCME 11597), s.d. J. Cifuentes 2007, (paratype, FCME 11831), 2009 (holotype, FCME 11830; isotype, XAL); Mpio. Tixtla de Guerrero, 2 km sobre desviación a El Durazno, carretera Chilpancingo-Tlapa, 6.viii.1981 Sierra López s.n. (paratype, FCME 1562), Suarez s.n. (paratype, FCME 1558). MICHOACAN—Mpio. Charo, Parq. Nac. Insurgente José Ma. Morelos, 9.ix.1983 G. Santiago s.n. (paratype, FCME 11596); Mpio. Sta. Clara, Pátzcuaro, San Gregorio, s.d. Guzmán 18152 (paratype, ENCB).
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—R. E. Tulloss
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