41888. | BOTANICAL GAZETTE. 89 
colored perigynia, which are less inflated and much more 
spreading, standing at nearly right angles to the axis of the 
spike.—Lansing, Mich. A large clump of this Carex was 
found growing between clumps of C. lurida and C. retrorsa. 
Its habit and characters were such as to at once place its hy- 
brid origin beyond a doubt. It also explains certain ambig-— 
uous specimens which have been sent me for name—I can, 
not now recall from whom—and which I recollect to have 
referred to C. lurida. Without an intimate acquaintance 
with C. lurida this hybrid will not be readily recognized. It 
is very likely to be mistaken for C. tentaculata. It resem- 
bles very closely C. tentaculata x lurida Bailey (C. tentaculata 
var. a/tior Boott). Infertile. 
Agricultural College, Mich. 
The distribution of Isoetes. 
LUCIEN M. UNDERWOOD. 
ures of their distribution on other continents. “he species 
Were classed by Engelmann as ‘‘ submerged,” *‘ amphibious’ 
and ** terrestrial.”’” Baker? makes four groups to which sim- 
ilar terms are differently applied, his group ‘‘Aquatice = In- 
cluding only a part of Engelmann’s ‘‘ submerged ”’ species, 
his group ‘* Subaquatice ”’ including the remainder, together 
2 ‘ ; oe Gite 
with Engelmann’s ‘‘ amphibious” species, his group Am- — 
390 (see) genus Isoetes in North America. In Trans. St. Lowis Academy of Science iv, 358- 
*Fern Allies, p. 124 (1887). 
