160 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
The removal of this species from Michenera leaves M. artocreas 
as the sole type of the genus, which now sinks to the status of a form 
genus whose only representative is the imperfect condition of Corticium 
subgiganteum Berk. 
Corticium alutaceum (Schrader) Bresadola. 
PI. 19, fig. 22-43. 
Bresadola (Hym. Hung. Kmetiani, p. 46 (110), 1897) gives the 
synonymy of this species as follows: Thdephora alutacea Schrader, 
Spic. FI. Germ., p. 187, 1794; Thelephora radiosa Fr., Obs., vol. 2, 
p. 277; Corticium radiosum Fr., Epicr., p. 560; Icon. Sel., tab. 
198, fig. 1; Corticium citrinum Pers., Myc. Europ., vol. 1, p. 136; 
Fr., Hym. Europ., p. 655. 1 
This species was collected several times during two successive 
years in the vicinity of Cambridge, Massachusetts, on well rotted 
oak logs, although never in large quantities. Material sent to Pro¬ 
fessor Burt was pronounced by him to agree well with European 
specimens in his herbarium from Bresadola. In the writer’s cul¬ 
tures two secondary methods of reproduction appeared which will be 
described below. 
The specimens collected by the writer were effused, thin, closely 
adnate, with rather indeterminate sometimes fibrillose margin, and 
varied in color from whitish or cream-colored to faintly ochraceous. 
The basidia are apparently not compacted into a dense hymenium; 
they are rather short (5-7 g X 20-40 g), only slightly clavate, 4-8 
spored (usually 5-6), and arise from septate, clamped, nodosely 
branched hyphae (pi. 19, fig. 22). The spores are hyaline, ovoid to 
lemon-shaped, slightly inequilateral, 3.8-4.5 g X 5.8-6.5 g, with gran¬ 
ular contents and often one or more guttulae (pi. 19, fig. 23). 
Germination of basidiospores. — An unusually large proportion of 
the spores was found to be capable of germination, and, although thin- 
walled, many retained this power even after remaining for more than 
three months in a dry condition. 
Germination is very rapid in drop cultures. The spore enlarges to 
several times its original volume and in from twelve to fifteen hours 
1 In addition to the synonymy given by Bresadola, Streinz and Fries mention as 
synonyms: Athelia ochracea Pers., Myc. Europ., vol. 1, p. 84, and Ganoderma radiosum 
Hoffm,, Veg. subterr , vol. 15, pi. 10, fig. 2. 
