66 
above, marginal cells inflated with oblique walls; vein ending 
below the apex, or excurrent into the subulate tip. Sporophyte . 
of two kinds. The normal, immersed ones of A. serrata, splitting 
in half when mature, becoming broadly flaring, with several rows, 
810, of dark collenchymatic cells bordering the mouth and form- 
ing the whole of the lid; the spores rough, .024-.027 mm. The 
hybrid sporophytes exserted ; seta 2-6 mm. ; capsule turbinate, not 
splitting in the middle, but with a smaller apical lid, which is 
bordered by one row of denser cells and is composed of parenchy- 
matic cells, as well as the walls of the capsule ; mouth bordered by 
two rows of dense oblong cells, and a persistent well-differentiated 
annulus ; spores .016—.018 mm., immature. 
Type locality near St. Louis, Missouri; type specimen No. 20, 
Drummond’s Southern Mosses, in the Herbarium of Columbia 
College. 
I wrote to Kew for information concerning Hooker and Wilson's 
specimens, and Mr. Wright says they also have a mixture in Drum- 
mond’s No. 20, but he does not mention any exserted capsules. 
“Some of the plants have broad leaves, similar to those of 
Phascum patens,as is shown by Sullivant in Mem. Acad. n. ser 
3:60. @ rr (1848) and in Sullivant’s Icones, ¢. 57. Others have 
longer, narrower leaves; and an almost sessile capsule, with a 
regular operculum. On another specimen (13b, Mississippi, 
Drummond) Wilson has written ‘In this tuft is also found Phascum 
patens.” 
Drummond's specimens were supposed to be the ones on 
which Sullivant founded his genus Aphanorhegma, but it is clear, 
on consulting his herbarium, that his set of Drummond’s mosses 
could not have supplied the figures which are given in the Me- 
moirs of the American Academy (3: 60. 4 2. 1848), for he had 
only a few old ragged plants of No. 20 with deoperculate cap- 
sules. He distributed in the Musci Alleghanienses No. 198 
(1846) specimens from Virginia and Ohio, as Schistidium serratum, 
and in the original description of Aphanorhegma in Gray's Manual 
he makes no mention of Drummond's specimens, and gives the 
distribution “from New England to Ohio.” These must be the 
types of the genus, and the ones figured in the Icones Muse. ¢. 57: 
