CERTAIN SPECIES OF Mucor 297 
gelatin, potato agar, dextrin gelatin, and rice. On starch paste 
and apple agar, however, the odor was slight. 
10. Mucor griseosporus sp. nov. 
Forming on bread a loose, erect, light grayish olive (Ridgway) 
turf, tinged brown, 3-4 cm. tall; sporangiophores with brownish 
membrane, 20-70 uw in diameter typically unbranched, or with 
one or two short lateral branches terminating in small sporangia, 
becoming septate in old cultures; sporangia globose, terminal 244~ 
302 w in diameter, encrusted with crystals, lateral up to 98 uw in 
diameter, at first yellowish becoming dark gray at maturity; 
sporangium wall deliquescent (except in small sporangia) leaving a 
basal membrane; columella free, pyriform, pyriform broadened at 
the base, or panduriform, 115-242 X 88-165 usually with 
yellowish to pale orange contents; spores uniform, elliptical se 
xX 5-6 yu (extremes 8-15 X 5-84u), clear gray, in mass alm 
black, sei EES ie esi not found (presumably ieeratialtic) 
[PLATE 18, FIGS ] 
This species “ characterized by its simple or slightly branched, 
septate, sporangiophores; its pyriform columella; and gray, uni- 
formly elliptical spores. It is related to M. piriformis Fischer, 
but differs from it in the fact that the lateral branches terminate 
in sporangia; in having septate sporangiophores; basal membrane 
present; and slightly larger, and clear gray spores. Collected a 
single time on dung. “No. 26. 
M. griseosporus grows as follows: on rolled oats, 70 mm. tall; 
on potato agar and cornmeal, 65 mm. tall; on starch paste and 
rice, 50 mm.; on bread and apple agar, 40 mm.; on bean agar, 
27 mm.; and on grapefruit, 21 mm. On rice there is no color 
production. It ferments dextrose to a slight extent, and oxidizes 
tyrosin. 
11. Mucor coprophilus sp. nov. 
Forming on bread a loose, light grayish olive (Ridgway) turf, 
2~-2.5 cm. tall; sporangiophores brown, 27-46 wu in diameter, rami- 
fying with long branches, or shorter, simple or ramified, more 
slender branches (terminating in small often deciduous sporangia 
20-62 yw in diameter, with rupturing membrane) ; sporangia (large 
terminal) globose, encrusted with crystals, 185-235 in diameter, 
whitish at first, becoming almost black at maturity; sporangium 
- wall readily deliquescent (except in the case of sporangia on dwarf 
sporangiophores), leaving a small basal membrane; columella free, 
