of the Genus Doassansia , Cornu . 25 
nular protoplasm, destined to form spores. The cortical cells 
appear to be divided off from the end of the spore-cells, but 
the details were not clearly seen. As the sorus matures, 
there is little trace of gelatinization, but the outer coat of 
hyphae becomes thinner and thinner until at maturity there 
is only a scanty covering left. 
When a mass of the endocarp containing sori is crushed on 
a slide in water, either the sori remain unbroken or else are 
broken into comparatively large fragments. The spores 
germinate in position, and the sori bristle on all sides with 
promycelia and sporidia. The promycelium reaches a very 
variable length, some beginning to form sporidia when only 
20 fj, long, others reaching a length of 400 fi to 450 /x before 
doing so. The promycelia are 4 /x to 8 /x in diameter at the 
periphery of the sorus, but 8 /x to 10 jut in diameter at the tip. 
This slightly swollen tip is very noticeable (Figs. 43 to 46). 
The sori, on account of their weight, sink to the bottom of 
the water and the promycelia grow up more or less obliquely 
toward the surface of the drop until the tip is at the surface 
or projects slightly beyond it. There now appears a circle of 
5 to 10 small protuberances on the broad, flat tip of the 
promycelium (Fig. 43), which proceed to grow out into long 
slender sporidia (Figs. 44 to 46). The sporidia are from 
20 /x to 40 [i long by 2 /x to 3 /x thick, slightly bowed and 
tapering to each end. They present a curious dark appear- 
ance as they project wholly or partially above the surface of 
the water. 
This stage of the germination has very much the appearance 
of the promycelium and sporidia of Title tia foetens , which I 
have germinated in the laboratory from material kindly sent 
by Prof. J. C. Arthur. The large broad promycelium, seeking 
the air to form the sporidia, which are so long and narrow, 
are features common to both. But any close resemblance 
stops at this point, for the sporidia of D. occulta do not con- 
jugate. They drop from the tip of the promycelium as soon 
as they are ripe, and either sink to the bottom or float just 
beneath the surface. Soon the sporidium begins to germinate 
