302 PovaH: A CRITICAL STUDY OF 
This mucor was obtained from the following sources: stem of 
decayed grape, decaying pine needle, Psalliota campestris (L.) Fr., 
sheep, rodent, and horse dung. Nos. 1, 3, II, 15, 16, 20, and 23. 
The species is characterized by its uniform, oval spores, its 
globose to subglobose, slightly adnate, columella and the lilac 
tint in the columellae and hyphae. This color is sometimes darker 
(pale purplish) in the hyphae near the substratum. 
Mucor griseo-lilacinus forms a drab gray to light drab (Ridg- 
way) turf, 10-20 mm. tall on rice and an 8-19 mm. gray turf on 
grapefruit. It ferments dextrose but does not oxidize tyrosin. 
The cultures on rice exhibit a pinkish buff line (Ridgway) around the 
margins of the upper surface of the medium. 
17. Mucor RAMANNIANUS Moeller, Zeitschr. Forst- u. Jagdw. 35: 
330. 1903 
Forming on bread a dense purplish vinaceous to livid brown 
(Ridgway) turf, 1-2 mm. tall; sporangiophores 2-6 uw in diameter, 
simple or with one branch, septate; sporangia globose, 20-35 u in 
diameter (extremes 40), red; sporangium wall deliquescent; 
columella free, globose, 4—10 yw in diameter; spores minute, globose, 
subangular, tinged pink, 2-3 » in diameter; zygospores not found 
(species presumably heterothallic). 
This species was isolated from soil in coniferous woods and 
from decayed carrot. Nos. 2 and 62. Lendner says, ‘‘the 
coloration of the sporangia is probably due to interstitial sub- 
stance,” but examination of the spores with oil immersion has 
shown them to be distinctly tinged with pink. 
Mucor Ramannianus varies but little. On bread and rice the 
height is 2 mm., but on grapefruit it does not exceed 0.5 mm. The 
color on rice is pale to light brownish vinaceous (Ridgway) while 
on grapefruit it is much brighter, light Corinthian red (Ridgway). 
This is the only species tested which did not ferment dextrose. 
Nor does it oxidize tyrosin. 
18. MucoR spINESCENS Lendner, Bull. Herb. Boissier II. 8: 79. 
1908; Les Mucorinées de la Suisse, 89. Berne, 1908 
Forming on bread a dense, fuscous (Ridgway) turf, 1-3 mm. 
tall; sporangiophores 8-12 u in diameter, simple or branche ; 
sporangia globose, 74-98 u in diameter (a few 50), brownish 
