CERTAIN SPECIES OF MUCOR 299 
etc.; sygospores not found (presumably heterothallic). [PLATE 20, 
FIGS. I-6.]| 
This species was isolated from soil (in hardwoods and tilled) 
four times; also from stable bedding and manure; from the stem 
of a decaying apple; and from Calvatia sp. (the last-mentioned 
collected by Dr. E. B. Mains). Nos. 18, 21, 29, 36, 37, 46, and 58. 
Mucor varians is characterized by the color of its turf, chamois 
to deep olive buff (Ridgway) in dried herbarium specimens; by 
the extremely variable shape of the columella; by its dissimilar 
spores; and by its habit of growth, i. e., the peculiar intertwining, 
coiling, and proliferation of the hyphae. This species resembles 
Mucor Jansseni Lend. in the shape of the columella. 
Mucor varians forms a light grayish olive to cartridge buff 
(Ridgway) turf, 25-30 mm. tall on rice, sometimes with the 
yellowish line at the edge of the surface of the medium. On 
grapefruit a gray or yellowish gray turf is formed, 8-15 mm. tall 
(sometimes with a bright orange line around the edge of the surface 
of the medium). It ferments dextrose but does not oxidize tyrosin. 
13. Mucor sATURNINUS Hagem, Ann. Mycol. 8: 265. f. Z. 1910 
Forming on bread a loose, gull gray (Ridgway) turf, 2-2.5 cm. 
tall; sporangiophores of two kinds, tall and short, the former 
composing the turf, the latter forming patches of dark gray felt 
(less than 1 mm. thick) on the substratum, tall sporangiophores 
12—35 uw in diameter, typically unbranched (sometimes with a single 
short branch ending in a sporangium), short sporangiophores 
simple or branched; sporangia globose, 57-156 » in diameter, at 
first yellowish, becoming almost black at maturity, finely incrusted 
with crystals; sporangium wall dark gray, deliquescent (in spo- 
rangia of tall sporangiophores), rupturing (or persistent in spo- 
rangia of short sporangiophores), leaving a large or small basal 
membrane; columella free, tinged grayish, oval to pyriform, 
34-107 X 39-80 uw, with or without pale orange contents; spores 
uniformly oval, variable in size, 6-8 X 4-6 w (extremes 4-12 
X 3-7 u), pale gray in mass; zygospores not found (presumably 
heterothallic). 
This species was found on horse dung and on decaying Col- 
lybia dryophila Bull. Nos. 10 and 68. 
Mucor saturninus is characterized by the varying height of the 
sporangiophores, by the shape of the columella, and by the uni- 
formly oval spores. The color of the turf is also characteristic. 
