CERTAIN SPECIES OF MucoR 247 
Although Bainier (1883a, 18830, 1903) described sixteen new 
species of Mucor, only six of these can be identified from his frag- 
mentary descriptions. Moreover, not more than two of the six 
species were completely described. 
Blakeslee (1904), in dealing with the genus Mucor, merely 
designated his different forms with Roman numerals, of which 
I and II were homothallic forms and III to VI inclusive were 
species heterothallic. 
Hagem (1908, 19100), limiting himself to a study of the air- 
and soil-inhabiting forms in Norway, isolated seventeen species, 
of which seven were new. Although he retained Zygorhynchus 
as a genus, he did not treat Rhizopus in like manner, but reduced it 
to a ‘“‘Subsectio” under Mucor. In his key he retains Van 
Tieghem’s grouping into forms with simple, racemosely, and 
cymosely branched sporangiophores. 
Lendner (1908) has satisfied a long-felt need in his publication. 
In the preface to his work we find that he has limited himself to: 
a treatment of the genera which contain many recently described! 
species. He recognizes fifty-one species under the genus Mucor,. 
including Glomerula repens Bain., Parasitella simplex Bain., 
Zygorhynchus Moelleri Vuill., and Zygorhynchus heterogamus 
Vuill. under the names Mucor Glomerula Lendner (Bain.), Mucor: 
parasiticus Bain., Mucor Moelleri Vuill., and Mucor heterogamus: 
Vuill. respectively. He, himself, collected but eighteen species, 
of which seven were undescribed. 
In his analytical key to the species of Mucor, Lendner used the 
arrangement of Fischer for his three large groups, viz.: (1) Mono- 
Mucor (comprising the unbranched forms), (2) Racemo-Mucor 
(branching in racemes or corymbs), (3) Cymo-Mucor (branching in 
sympodial cymes). Under the first division he includes ten 
species, which are arranged according to the morphological char- 
acteristics, such as height, color, size of sporangia, sporangium 
wall, shape of columella, spores, etc. In the second group he has 
twenty species, arranged in much the same fashion as in the 
first section. The third group is the largest, having one more 
species than the second. This section, for the most part, is 
divided in the same manner as the two previous ones, but in two 
places the author makes use of physiological characteristics as a 
