312 
Batters * — On some New 
There is a variety of M. clavaeformis , which I have called 
var. subcylindrica , which outwardly closely resembles M. 
densa, but in this variety the branches are either perfectly 
simple or bear only one or two short patent secondary 
branches. In M. densa the plurilocular sporangia are either 
isolated or collected into little groups of from two to four, 
they are stalked, about 40 or 50 [i long and from 6-10 wide ; 
they usually contain but a single row of cells. In the other 
two British species of Myriotrichia , the plurilocular sporangia 
are usually sessile and conical, containing three or four tiers 
of cells, and the unilocular sporangia are always sessile ; while 
in M. densa the plurilocular sporangia are stalked, elongated, 
and frequently contain as many as a dozen tiers, and the 
unilocular sporangia are stalked ; the radiating branches, 
moreover, are much more evidently moniliform in M. densa 
than in the other species. The British species of Myriotrichia , 
with their principal varieties, may be grouped thus : — 
A. Axis clothed throughout with radiating branches ; pluri- 
locular sporangia conical or elongated, not collected into 
dense masses. 
I. Upper branches longer than lower and bearing a few 
patent secondary branches. 
a. Branches few and scattered ; plant small, from 
inch long. M. clavaeformis , Harv. var. minima , Holm, 
et Batt. 
/ 3 . Branches numerous, closely set ; plant from i to 12- 
inch long. M. clavaeformis , Harv. var. typica . 
II. Branches of nearly equal length throughout the 
entire length of the frond. 
a. Horizontal branches bearing closely dichotomous, 
or secund level-topped secondary branches ; sporangia stalked, 
gametangia elongated. M. densa. 
( 3 . Horizontal branches simple or bearing only one or 
two patent secondary branches ; sporangia sessile, gametangia 
conical. M. clavaeformis var. subcylindrica. 
B. Axis clothed only at intervals with short simple 
