Zygorrhynchtis japonicus , ime nouvelle Mucorinee heterogame, etc. 
3 
Dans son etude sur le Z. Moelleri, M. A. F. Blakeslee dit 1 ): 
“In the simpler ease illustrated by the more common mode of conjugation, 
a terminal portion of an erect hypha is distinguished by a septum from 
the portion below. Immediately beneatk this septum is produced a 
branch, which, growing upward, recurves to meet the side of the slender 
zygophoric filament cut off by the septum already mentioned. The two 
zygophores are from the beginning unlike in character as well as in 
origin. While the first, which contains but a small amount of protoplasm 
tliat becomes massed at the point of contact with the other, undergoes 
no further development, the second, which has arisen immediately below 
it, is from the outset richly supplied with dens protoplasm. Immediately 
after contact a progamete is developed as a perpendicular outgrowth from 
the slender erect zygophore, and in juxtaposition to this a progamete is 
formed by the terminal enlargement of the more vigorous zygophoric 
branch. In eacli of these progametes a transverse septum is formed, 
distinguishing the gametes which are unequal in size, the larger being 
formed on the side of the vegetatively more vigorous zygophore. This 
difference in size is always distinct, though in some cases less mar- 
ked than in others. The contents of the two gametes become united 
tkrough the disappearance of the intervening wall, and the zygote liere 
formed, by the gradual enlargement of the two cells thus united, assumes 
the shape of a mature zygospore. The supply of nutrient for this ripening 
process comes almost entirely by way of the more vigorous zygophoric 
branch, and, although the stretched wall of the larger gamete makes up 
the greater part of the outline of the zygophore, still the stretched wall 
of the smaller contributes to it. Although it may show a certain tendency 
in this direction, the condition here is thus not comparable to an oöga- 
mous fertilization where the male gamete furnishes protoplasm to, but 
form itself no essential part of, the mature oöspore.” 
C’est vrai dans les autres especes du genre Zygorhynchus 2 ), ainsi 
que dans notre espece aux premieres stades de la formation des zygo- 
spores (fig. 4 a). Le bourgeon lateral qui est forme au dessous de la 
cloison, au lieu de se courber pour rencontre avec le rameau grele, 
s’allonge parallelement ä celui-ci, qui en meme temps emet une emergence 
laterale au voisinage de la cloison en face de cette protuberance, de sorte 
que son extremite vient au contact avec le flanc de cette derniere (figs. 4 b, 
ha). Ensuite, celle-ci emet encore une emergence laterale opposee a la 
premiere et se renfle (figs. 4 c, 5 b). Les deux gametes, tres inegaux, 
ainsi constitues par des rameau heterogenes, s’appliquent Fun contre 
Fautre, s’isolent de leurs generateurs par une cloison transversale (fig. ob). 
La membrane mitoyenne se resorbe rapidement et la zygospore s’aggrandit 
(figs. 5c et öd). 
Diagnose: Zygorhynchus 'japonicus Kominami nov. spec. — 
Hyphis sporangiferis 9—15 g. latis; Sporangiis globosis 56 g 
1) Blakeslee, F., Sexual reproduction in the Mtccorineae (Proc. of 
tlie Amer. Acad. of Arts and Sc. 1904, 40, Nr. 4, p. 297). 
2) Namyslowski, 1. c. — Moreau, F., Les phenomenes morpholo- 
giques de la reproduction sexuelle chez le Zygorhynchus Dangeardi 
Moreau (Bull. Soc. Bot Fr. 1913 [4e Ser., 13 ], p. 717). — Blakeslee, F., Conju¬ 
gation in the keterogamic genus Zygorhynchus (Mycol. Centralbl. 1913, 2, 
p. 241—244; pls. I, II). 
1* 
