Baird—History of Phycomyces Nitens (Agardh) Kunze, 377 
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repos. Le noyau en division. Mitose et amitose. Bull. Soc. Mycol. 
France 27: 204-210. 
-(1911 b). Deuxieme note sur les Mueorinees. Fusions de noyaux et 
degenerescence nucleaire dans la zygospore. Fusions de noyaux sans 
signification sexuelle. Bull. Soc. Mycol. France 27: 334-341. 
-(1913). Eecherclies sur la reproduction des Mueorinees et de quelques 
autres Thallophytes. Botaniste 13: 1-136. 
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EXPLANATION OF FIGUEES 
All figures drawn with the aid of the camera lucida. 
Figs. 1—10, 14a, 15a, 15b and 16 are from Phycomyces nitens. 
Figs. 11-13 and 14b are from Ehisopus nigricans. 
Magnification of figures 7 and 8, 90 diameters; figure 5, 186 diameters; fig¬ 
ures 2 and 16, 1050 diameters; figure 5b, 2100 diameters; and all other figures 
3250 diameters. 
Plates XIV and XV 
Pig. 1. Germinated spore. 
Pig. 2. Hypha from substratum, from culture 3 days old, grown from spore. 
Figs. 2a-2f. Nuclei from hyphae similar to that in fig. 2. 
Pigs. 3a and 3b. Nuclei from sporange before spore formation. 
Pigs. 4a-4k. Nuclei from gametes showing various stages in nuclear division. 
Pig. 5. Young zygospore during growing period, showing portion of a sus- 
pensor to the right. 
Pig. 5a. A group of nuclei from zygospore shown in fig. 5. 
Fig. 5b. Detail of protoplasm from zygospore in fig. 5. 
Figs. 5c and 5e. Dividing nuclei from zygospore in fig. 5. 
Pig. 5d. Nucleus of same zygopore aroimd which a vacuole has formed. 
Pigs. 6a and 6b. Nuclear division figures from a maturing zygospore and 
with comparatively large nuclear vacuoles. 
Fig. 7. Mature zygospore, about 5 days old. The numerous dense bodies are 
the nuclear structures, referred to in text, in which the nuclear vacuoles are 
filled with reserve material. 
Figs. 7a-7d. Nuclear structures with reserve material. 
Fig. 8. Germinated zygospore with dense cytoplasm around nuclear struc¬ 
tures in peripheral region at the right; nuclear structures with reserve still 
unchanged in the central region. A small portion of germ tube appears. 
Pig. 8a. Cytoplasmic mass formed around nuclear bodies. 
Pigs. 8b-8d. Nuclear structures from which reserve material has been dis¬ 
solved. 
Figs. 9a-9c. Nuclear division figures from sporange before spore forma¬ 
tion. 
Figs. lOa-lOc. Nuclear division figures from vegetative hyphae. 
Figs, lla-llc. Nuclear division figures from young zygospore. 
