1916] 
BURT—THELEPHORACEAE OF NORTH AMERICA VI 205 
subgenera of Corticium. As several species of Corticium 
were still included in Hypochnus, Fries had good reason for 
regarding Hypochnus in his sense as closely related to Cor- 
исшт. Karsten’s emendation of Hypochnus a few years 
later was logical, and in sympathy with the work of Fries, 
for it retained this name for the greatest number of co- 
generic species both originally published in the genus and 
retained in the final work of Fries. These species are fur- 
thermore the only species for which the generic name Hy- 
pochnus can be retained, for the other species of the sub- 
genus in Fries’ ‘Hymenomycetes Europeae’ revert to Cor- 
ticium under modern study. 
Hypochnus, as presented in Saccardo’s ‘Sylloge Fungo- 
rum,’ is an aggregation of species of several genera and 
includes also the tropical lichens which Fries excluded from 
the genus in 1874. Hypochnus as given in Engler & Prantl’s 
‘Die Natiirlichen Pflanzenfamilien,’ is the presentation of a 
purely academic scheme of Schroeter’s as to how the lower 
Hymenomycetes ought to be classified to have a family 
Hypochnacei, but the fungi do not fall in with the scheme. 
They cannot be separated from Corticium and Peniophora. 
Von Hohnel and P. Sydow have pointed out! that Hypochnus 
in the sense of Schroeter must be abandoned as a genus and 
its species take their proper places in other genera. It is to 
be regretted that Saccardo’s ‘Sylloge Fungorum’ and Engler 
& Prantl’s ‘Die Natürlichen Pflanzenfamilien’ give a false 
lead with regard to Hypochnus, for these works are the main 
reliance of plant pathologists in the matter of genera. 
Ккү то THE SPECIES 
Spores distinctly colored as seen with the microscope ................. 
Spores e? ES yellowish or hyaline as to appear hyaline or nearly 
inder the microse соре......................аЖ ee 
1 Fruetification {етти inous,’’ i. e, Sudan-brown,* Brussels-brown, = 
hazel of Ridgway spores concolorous with the fructification, but w 
yellow under E mieros eope er HESS cR Lo 
1Ann. Myc. 4:551. 1906. See also von Hóhnel & Litschauer, Ann. Myc. 
4:288. 1906. 
e technical color terms used in this work are those of Ridgway, Color 
Standards and Nomenclature. Washington, D. C., 1912. 
