1905] BLAKESLEE—CONIDIA-BEARING FUNGI 169 
formation on paired heads which are located at points of branching 
of the fertile hyphae is essentially the same for both species. The 
outgrowths on the convexities of the sterile branches in Sigmoidio- 
myces are represented in Thamnocephalis by mere protuberances; 
the spores and their echinulations are much reduced in the latter; 
and the branches of the fertile hyphae are not markedly curved in the 
mature condition. Sigmoideomyces fails, moreover, to show that 
striking differentiation into fertile crown, main stalk, and rhizoidal 
props, which is a unique feature of Thamnocephalis. Sigmoideo- 
myces was described from mature material, and it was not possible 
to determine the nature of the mycelium nor the time of septation of 
the fertile hyphae, but the similarity in the two forms would suggest 
that much the same condition exists as in Thamnocephalis. 
Marrucuor has. emphasized the systematic importance of non- 
septate hyphae, and the condition in Cunninghamella shows that the 
presence of sporangia is not a sine qua non for admission to the com- 
pany of the mucors. The absence of septa in young growing hyphae 
is a mucor character, but hardly less characteristic is their presence in 
varying abundance in older hyphae from which the protoplasm has 
been withdrawn. Cunninghamella is no exception to this statement 
(fig. 3), but perhaps Piptocephalis and Spinellus macrocar pus furnish 
as striking examples of septation in fertile hyphae as the group 
affords. The delicate anastomosing mycelial hyphae further remind 
one of the similar condition in Syncephalis. THAXTER (I. c.), MATRU- 
cHor (I. c.); and others have recognized the possibility of Rhopalo- 
myces belonging to the Mucorineae. Without evidence from cultures 
the relationship of Sigmoideomyces and Thamnocephalis with the 
mucors must be left as only a suggestion. _ 
Microscopic preparations and herbarium material of Thamno- 
cephalis quadrupedata have been deposited in the Cryptogamic Her- 
barium of Harvard University. 
NaPLes BIoLocIcaL STATION. 
EXPLANATION OF PLATE VI 
i The drawings were outlined with the aid of a camera lucida with the com- 
bination of Leitz and Bausch & Lomb lenses noted and have been reduced 
about one-quarter in reproduction. 
