1905] BLAKESLEE—CONIDIA-BEARING FUNGI 165 
In many heterothallic species the (—) is distinguished from the 
(+) strain by any one of a number of different characters, which in 
general indicate a less luxuriance in vegetative growth. No char- 
acters have been found as yet, however, by which one can distinguish 
between the sexual strains of Cunninghamella when grown apart in 
pure cultures. 
Sufficient material has not been investigated to enable one to 
determine the relative abundance in nature of the strains of this 
species. In addition to the two (+) and (—) strains from Vene- 
zuela and Porto Rico already mentioned, a culture originally obtained 
from horse dung has been kindly communicated to the writer by 
ATKINSON, and the same species has recently been found on a speci- 
men of dung kindly sent from the Philippines by CopeLanp. Of 
these two latter, one is (—) and the other (+), so that in the four 
cultures tested none are neutral, and the (+) and (—) strains are 
equally represented. 
TH HALIS, n. gen. 
Vegetative hyphae fine, continuous, anastomosing. Fructifica- 
tions erect, consisting of a main stalk supported above the substratum 
by stout rhizoidal props and bearing a bushy crown of subdichotom- 
ously branched fertile hyphae terminated by sterile branches. Spores 
solitary, borne on the surface of spherical heads. Heads borne at the 
apex of short lateral stalks which arise at nodes from opposite sides 
of the fertile hyphae at right angles to their planes of branching. 
Thamnocephalis quadrupedata, n. sp. 
Vegetative hyphae delicate, about 3# in diameter, branched and 
freely anastomosing. Fructifications scattered, rose-brown, tree- 
like, about 0.75™™ tall. Main stalk thick-walled, tapering from 
about 15@ at base to about 8“ wide at apex, supported at maturity 
by two pairs of stout rhizoidal props which are anchored to the sub-- 
stratum by branches given off from their lower ends. The shriveled 
remnant of a fifth rhizoid hangs down midway between the two pairs 
of props, and a beak-like projection occurs on the side opposite the 
main stalk as the remains of an abortive secondary erect stalk. 
Hyphae of the crown 7-10 times dichotomously or subdichotomously 
branched, the planes of dichotomy being successively at right angles 
