of the Genus Doassansia, Cornu . i 7 
hyphae are about 2 /x in diameter, rather infrequently branched, 
except in the neighbourhood of the larger air-spaces, and 
septate at short intervals. 
The palisade-parenchyma of the leaf comprises only one 
row of rather short cells, while two-thirds of the thickness of 
the leaf is taken up with the rather loose spongy layers. 
The sori are situated in the larger air-spaces of the latter, 
just over the stomata. They are irregularly spherical or 
ellipsoidal in shape, 120 /x to 220 fx by 80 [x to 120 /x large, 
dark-brown to black on the outside, and light-brown on the 
inside. The spores are polygonal to almost ellipsoidal, with 
moderately thick brown walls, and light, oily contents. They 
measure 8 /x to 12 /x by 6 /x to 8 /x. The cortical cells are 
small, irregularly polygonal in shape, much flattened radially, 
with thick, dark-brown walls. They are 8 /x to 10 /x in 
diameter in tangential sections and 4 /x to 6 /x in radial section 
(Fig. 66). Outside of this layer is a more or less complete 
covering of indurated hyphae. The germination has never 
been seen. 
Doassansia epilobii seems to be a true Doassansia, although 
it bears a striking resemblance in structure to the form 
described as D. decipiens . It seems to possess a true cortex 
of sterile parenchymatous cells, which more or less covers the 
sorus, but these cells are small and difficult to demonstrate, 
and do not differ in any greater degree from the hardened 
hyphal cells which cover the sori of D. decipiens than they do 
from the cortical cells of the preceding species or of D. 
alismatis . But, as far as dried material shows, it is to be put 
rather with the species of Doassansia , at least until a more 
careful study from fresh material is possible. Fisch suggests 
(Ber. Deutsch. Bot. Gesell., Bd. II, p. 407) that this is a species 
of Synchytrium. But the presence of a mycelium as well as 
the structure of the spores shows that it is not of that genus. 
Season. Found in August, 1882. 
Distribution. Occurring thus far only at King’s Ravine, 
White Mountains, N. H., Farlow ! 
C 
