LYMAN: STUDIES OF HYMENOMYCETES. 
151 
A further consideration of the nature of oidia and chlamydospores 
is reserved for a later page (see p. 194), after the discussion of the six 
species mentioned above as possessing more highly developed secondary 
reproductive methods. 
CORTICIUM SUBGIGANTEUM Berk. 
(Michenera artocreas B. & C .) 
PL 18, fig. 2-21; pi. 26, fig. 137. 
It has for some time been suspected that an organic connection exists 
between Michenera artocreas and the Corticium which usually accom¬ 
panies it. In order to test this point, specimens of Michenera and 
the associated Corticium were collected in swamps at Kittery Point, 
Maine, and at Bedford and East Billerica, Massachusetts, on dead 
limbs of Acer. The spores of both Michenera and Corticium were 
germinated and grown in cultures and the connection which had been 
suspected between the two forms was conclusively proven. This 
Corticium was distributed by Ellis & Everhart in North American 
fungi, no. 3102, as Corticium ochroleucum Fr., var. resupinatum E. 
& E. The label bears the following note: “ Michenera artocreas 
B. & C. is usually found associated with this and growing out of it.” 
But after examining the writer’s material Professor Burt says: “Your 
specimen is certainly Corticium subgiganteum of Berkeley. This 
species was distributed by Ellis & Everhart as Corticium ochroleucum 
Fr., from which it is quite different according to an authentic speci¬ 
men in the Kew Herbarium.” 
Corticium subgiganteum. — This species was described by Berkeley 
in “Notices of North American fungi,” (Grevillea, vol. 2, p. 3, July, 
1873). Massee, in his Thelephoreae (’90-’91), transfers the species 
to Peniophora, but without having seen a specimen. It has been 
reported from a number of widely separated regions of the United 
States, particularly near the Atlantic coast, from Maine to Florida, 
and as far inland as Ohio. It occurs principally upon species of 
Acer, but is also found upon Magnolia and Carya. 
The fructification sometimes forms small patches, but is usually 
effused; it is smooth, of rather tough, fibrous consistency, and becomes 
corky when dry. The color is described by Berkeley as “at first 
cream-colored, then acquiring a brownish tint, especially toward the 
