142 
Mycologia 
e. Conidia rough ; cultures 2647 and 2733 from English soiE* and 2500 from 
New York soil. 
ee. Conidia smooth, yellow hyphae becoming reddish in age, reverse and agar 
from salmon-orange to mahogany-red. 
/. Floccose or tufted. P. pinophilum Hedgcock.- Numerous cultures obtained 
from soil and from food products can not be separated from this 
species. 
ff. Velvety, broadly speaking. Thom No. 43. 
CC. Growing colonies with margin variously changing through sea-foam green, 
chartreuse-yellow, or chrysolite-green (Ridgway XXXI), replaced 
by conidial areas toward celandine-green or andover-green (Ridgway 
XLVII). Reverse in reds toward oxblood-red (Ridgway I). Deep- 
red sclerotia developed in age. P. purpurogenum, var. rubri-sclero- 
tium, var. nov.23 This organism has been obtained from many 
sources and widely separated sections of the United States. 
CCC. Colonies showing little or no yellow at first, yellow hyphae appear fre- 
quently in secondary growths in the centers or margins of older 
colonies. Reverse colors intensely red. 
g. Conidiophores mostly borne as branches from interlacing aerial hyphae and 
ropes of hyphae. 
h. Conidial fructification typically verticillate. P. africanum Doebelt, Ann. 
Mycol. 7 (1909) No. 4, pp. 315-338- 
hh. Conidial fructifications branched several times. P. funiculosum, Thom, 
1. c., p. 70. 
gg. Conidiophores arising as branches from separate hyphae. Complex ropes 
not found. 
P. purpurogenum O. Stoll.“ 
Cultures have been found from American sources, especially several from 
corn {Zea Mays) which cannot be separated by satisfactory marks from the 
original strain distributed by Krai. The species is probably cosmopolitan. 
Bureau of Chemistry, 
U. S. Dept, of Agriculture. 
^ Contributed by Miss E. Dale, Cambridge, England. 
22 Thom, C., 1 . c. p. 31. 
23 P. purpurogenum var. rubri-sclerotium, var. nov. Differs from typical de- 
scription of the species in the production of dark-red sclerotia on the surface 
of the substratum and in the well marked zone of yellow at the margin of the 
growing colony. It appears to be a soil fungus with well marked characters. 
“The nomenclature of this form is discussed by Thom, 1 . c. p. 36. 
