Pluteus atromarginatus
Bull. mens. Soc. linn. Lyon 5: 51. 1935.
Photo: The marginate nature of the gills is not evident in this photo.
Common Name: none
Cap 6-11 cm broad, convex, expanding to plano-convex, often with a low umbo; margin at first incurved, becoming decurved, plane to occasionally uplifted; surface moist, the disc tomentose to matted tomentose, nearly black, elsewhere radially streaked with grey-brown appressed fibrils; context white, firm, unchanging, thin, except up to 1 cm at the disc; odor mild, taste mild to slightly of radish.
Gills free, close, whitish, becoming dingy-pink, the edges brown; lamellulae up to 5-seried.
Stipe 5-12 cm long, 0.7-1.3 cm thick, solid, equal to enlarged slightly at the base; surface of appressed grey-brown fibrils over a pallid background; veil absent.
Spores 6.0-7.5 x 4.-4.5 µm, ovoid to broadly ellipsoid, smooth, hilar appendage not evident; spore print pinkish-tan.
Solitary to scattered on conifer wood or debris, e.g. Monterey pine (Pinus radiata) stumps and logs; fruiting in the early fall.
Edible, but untried locally.
Distinguishing features of this handsome wood rotter are a streaked, brownish-grey cap and brown-marginate, free gills. It is sometimes confused with the more common Pluteus cervinus, but the latter has a uniformly brown cap and lacks marginate gills. Another dark-capped Pluteus occasionally found is Pluteus magnus. It is more robust than P. atromarginatus, has a nearly black cap, and like P. cervinus, lacks marginate gills. Though Pluteus species are seldom picked for the table, inexperienced collectors should be aware that members of the genus Entoloma, many of which are toxic, are similar in stature and also have pink spores. They can told apart, however, by attached gills and a terrestrial, not lignicolous habit.
Banerjee, P. & Sundberg, W.J. (1995). The Genus Pluteus Section Pluteus (Pluteaceae, Agaricales) in the Midwestern United States. Mycotaxon 53: 189-246.
Bas, C., Kyper, T.W., Noordeloos, M.E. & Vellinga, E.C. (1990). Flora Agaricina Neerlandica -- Critical monographs on the families of agarics and boleti occuring in the Netherlands. Volume 2. Pluteaceae, Tricholomataceae. A. A. Balkema: Rotterdam, Netherlands. 137 p.
Bougher, N.L. & Syme, K. (1998). Fungi of Southern Australia. University of Western Australia Press: Nedlands, Australia. 391 p.
Orton, P.D. (1986). British Fungus Flora: Agarics and Boleti. Vol 4. Pluteaceae: Pluteus & Volvariella. Royal Botanic Garden: Edinburgh, Scotland. 99 p.
Singer, R. (1956). Contributions Towards a Monograph of the Genus Pluteus. Trans. Br. Mycol. Soc. 39(2): 145-232.