CERTAIN SPECIES OF Mucor 301 
diameter, tall and short, tall forming the turf, and short remaining 
only 1-2 mm. in height, fail sporangiophores with long (more or 
less) straight branches, short sporangiophores with short (sporangia 
sometimes appearing almost sessile), usually circinate branches, 
always with septum immediately above point of insertion of 
branch; sporangia globose, 60-80 yu in diameter (extremes 39-98 4), 
encrusted with tiny crystals, at’ first pale yellowish, becoming 
deep bluish gray at maturity; sporangium wall deliquescent (in 
sporangia of tall sporangiophores), rupturing (or persistent in 
sporangia of short sporangiophores), leaving a large or small basal 
membrane; columella globose to oboval, free or slightly adnate, 
33-39 X 31-33 m (extremes 20-58 X 17-47 4); spores uniformly 
oval, gray in mass, 5-6 X 4-5 uw (a few 8 X 5 u); chlamydospores 
forming creamy patches (sometimes to the exclusion of sporangio- 
phore production) on surface of substratum, globose, oval to 
ventricose fusiform, terminal or intercalary, singly or in bead- 
like chains, 16 w in diameter or 20 X 10-12 yu; zygospores not found 
(species presumably heterothallic). —. 
This species was collected twice: once, by the writer, on dung 
(squirrel?), and once on old bones in the Zoological Laboratory of 
the University of Michigan by Miss C. Reeves. Nos. 12 and 30- 
Mucor griseo-cyanus forms a gray turf 15-20 mm. tall on rice 
and a 10-12 mm. gray turf on grapefruit. It has the ability to 
ferment dextrose but can not oxidize tyrosin. 
16. Mucor griseo-lilacinus sp. nov. 
Forming on bread a dense, mouse gray (Ridgway) turf becoming 
in age tinged with drab, 1-1.5 cm. tall; sporangiophores 8-20 y in 
diameter, at first simple, later with one or two lateral branches 
which are in turn ramified once to three times (exceptionally 
eleven times) with branches always terminating in a sporangium, 
and with a septum above point of insertion of branch; sporangia 
globose or subglobose, 60-80 » in diameter (extremes 40-100 h), 
at first yellowish, becoming dark gray with greenish tinge at 
maturity ; sporangium wall deliquescent, leaving a basal membrane; 
columella free or slightly adnate, globose to subglobose, 27-43 u 
in diameter (extremes 12-67 yu), tinged lilac gray; spores uniform, 
oval, 4-6 X 3-4. (a few large, 8 X 6, 10 X 5), pale gray in 
mass; chlamydospores and oidia present in hyphae, chlamydospores 
globular to barrel-shaped, 10-30 u in diameter; hyphae (especially 
those near the substratum) with a lilac tinged membrane and 
often with orange yellow contents; zygospores not found (species 
presumably heterothallic). [PLATE 18, FIGS. 6-10. 
