ae g. Plant very delicate, often minute, 3 to 4 inches long 34 
524 ‘ 
5. N. MUCRONATA TENUIOR A. Br. This beautiful form was 
collected in the province of Ise, and doubtless is to be referred to 
this variety. The leaves (6) are at times 3-divided (flabellata), 
and now and then the sub-terminal is septate, thus connecting it 
with WV. gracilis Kutz. The whole plant is very slender, leaves 
170 in diameter, mucro 34 in diameter at base. The oogonia are 
usually solitary in both divisions of the leaves;, the oospore 
averages 306 long, 270 broad, with 6 striae; the surface reticu- 
lated, the reticulae 2 to 7 in diameter (easily seen with a half-inch 
lens). 
6. N. Japonica Allen; from province of Ise. 
7. N. ORIENTALIS sp. nov. 
Nos. 7, 8 and 9, though variable, may belong to the same spe- 
cies.. Plant 6-8 inches long, repeatedly branched, the verticils. cas 
often densely tufted when young. Leaves 3-4-divided, ter 
minals very slender, of variable length (elongated or very short); | 
oogonia one (or two) at a node; coronula short and small, but " 
the apical cells much longer than the sub-terminal, which are a 
small and disk-shaped. Antheridium 275 in diameter, oospore — 
306 to 340 long by 270 broad (in'our specimens immature). < 
8. Plant 8 to 10 inches high, very slender, with remote verticils 
(spreading), consisting of 6 to8 leaves. Leaves diarthrodactylae, 
four times divided, terminating in a mucro; the ultimate segments 
unequal, at times élongated and slender, at times quite short 
(brachydactylae) ; the leaf 200 diameter, the first segment 156, the 
second (102) to 150, the third (88) to 142 the terminal 88 to 95 - 
- diameter, the mucro 55 to 60 long. oe 
Oogonia clustered (2 to 3) at the nodes of the leaves, coronm™® 
not elongated, cells connivent, 60 broad, 48 high, and oospore a7e, 
to 306 long, 170 to 240 broad; (measurements of several mature 
oospores, give length and breadth as follows, 340 by 292» 353 by 
306, 360 by 292, 368 by 292, 368 by 306, 368 by 319); with 
rather blunt ridges, rarely 7 or 9; surface minutely roughene | 
with granules, which are quite coarse and more prominent at OnF 
or two points on the shell, usually near the apex. ee 
3-4-divided ; stem diameter 102, leaf first node 75, second 2 
» fourth 34, mucro 70 long, very slender. Antheridia. 
