193 
M. spinosus Van Tiegh. Ann. Sci. Nat., Ser. 6, Vol. 4, p. 390. 
Sporangiophores upright, stiff, up to 1 c.m. high, branched, septate 
above the insertion of the branches ; sporangia terminal on the main 
stem and branches, small, globose, about 100m 1n diameter, at first 
colourless, becoming dark-brown or black, covered with delicate 
spines ; sporangium wall disappearing, leaving a basal collar ; colu- 
mella cylindrical or pyriform, with one or more short, irregular out- 
growths at the top ; spores globose, 5-94 In diameter, greyish-brown, 
smooth ; zygospores globose, yellowish-brown, the exospore with 
dark, irregular, lamelliform markings that rise to a point; gemmae 
formed in the hyphe. 
On horse dung, vegetable refuse, &c. Found on a leaf of a cherry 
tree from Kent, July, 1901. The spores were not smooth as given 
in Van Tieghem’s diagnosis, they were finely echinulate. In other 
respects the specimen agreed with the description of the type. 1344 
Xie Os 
M. racemosus Fres. Beitr. z. Mycol., p. 12. 
Sporangiophores upright, stiff, varying in height, forming brownish- 
yellow patches, irregularly much branched ; sporangia globose, small, 
varying in size, 20-70 in diameter, somewhat yellowish, transparent, 
sporangium wall persistent, with small incrustations of lime, and a 
short basal collar ; columella broadly clavate, varying in size, 17-60 
long, 7-30 broad at the base, 9-42 above, sometimes globose, spores 
globose, or shortly elliptical or angular, 5-8 x 6-10, smooth, yellow- 
ish in the mass; zygospores globose, 70-85 in diameter, brownish, 
the exospore beset with reddish-brown, bluntly conical warts ; 
gemmae or chlamydospores always in great abundance in every part 
of the hyphz, colourless or yellowish, smooth, very variable in form, 
I1-20u X 20-30u or globose, 20u in diameter. 
On all decaying matter. Found on farm-seeds. Norwood, June, 
190re) Plvix., 1e.7- 
Rhizopus umbellatus A. L. Sm. PI. 1x,, fig. 5. 
Spreading hyphz with sucker-like roots, delicate, about 8-10 in 
width ; sporangiophores rising singly from the runner-like hyphz up 
to 500u in length, and branching above in an umbellate manner ; 
secondary branches usually four, sometimes septate, slightly wider at 
the top, and terminated by a subglobose sporangium 50x 603 spo- 
rangium-wall delicate, attached to the base of the columella; 
columella globose, 304 in diameter ; spores minute, oblong, blunt, 
5x2u. The whole plant colourless. 
On a seed of red clover in the germinating case, entangled with 
Mucor erectus. Norwood, June, 1901. 
