Many saprophytic agarics fruit readily in pure culture on nutrient agar, but this phenomenon is rare in mycorrhizal Agaricales (Pantidou, 1964). The culture characteristics of various Laccaria Berk. et Br. species, including L. laccata (Scop.) Berk. et Br., were used to some extent while I was studying the systematics of this genus but under no conditions did the cultures produce basidiocarps while in pure culture in nutrient media. The report by Davis and Jong (1976) that L. laccata fruited in pure culture was of great interest for this reason. I obtained their isolate ATCC 24509, which Davis and Jong isolated from soil, not basidiomata, to attempt basidiomata formation in culture as indicated in their article. The color of the basidiomata, the non-ornamented spores, and the siderophilous basidia of the isolate place the species in the genus Lyophyllum Karsten. All species of Laccaria have ornamented spores and do not produce the classical carminophilous granulations found in ATCC 24509. Since Davis and Jong did not describe the basidiomata in detail, a description of the basidiomata characteristics obtained in my culture is provided below. Cultural data were supplied and are not duplicated here except to note that the culture showed a positive reaction for extracellular oxidase when tested with guaiacum and 95% ETOH (Nobles, 1965). The basidiomata were obtained when the isolate was grown on ATCC medium 340, 12 h light, 12 h dark, and 22 C. Dried specimens are deposited in Toronto (TRTC). Formula for this medium is listed in the ATCC catalogue of strains (Anon., 1974). In the description to follow, color data refer to Kelly (1965). LYOPHYLLUM SP. PILEUS 5-16 mm diam, at first pulvinate to convex, becoming plane with a depressed center, with undulating and uneven margins and a nearly dentate edge, moist to dry, pruinose, moderate yellowish brown (77) to greyish yellowish brown (80), becoming dark yellowish brown (78) to dark greyish brown (62) with age, greyish yellowish brown (80) to light greyish yellowish brown (79) at the margin. LAMELLAE variously attached, varying from sinuate to adnate or decurrent, distanced, broadly triangular in section, 1-2.5 mm wide, concolorous to the pileus surface; forking and lamellulae present. STIPE 15-65 x 3-7 mm wide at base to 2-3 mm wide at apex, with a bulbous base, compressed along most of its length, fibrous, hollow, not radicating but superficial on the medium surface, dry to moist, pruinose, concolorous to the pileus surface but often with a silvery sheen, upon drying or injury not blackening or blueing; basal mycelium white and spreading out onto the agar medium. TRAMA of the pileus and stipe concolorous to the surface and very thin; odor strongly musty; taste musty; with an oily feel to the palate. SPORES (4.5-)4.7-5.3(-5.5) x (3.8-)4.2-5.2(-5.5 um) (n = 30,x ? s.d.), globose to subglobose, rarely ellipsoidal (L/W = 1-1.2) (see fig. 3 in Davis and Jong), hyaline, non-amyloid, with an extremely small hilar appendage, smooth with no sign of ornamentation under the light microscope or the scanning electron microscope. 1 This work represents a portion of the author's Masters dissertation. Author's present address: