842 THE JOURNAL OF BOTANY 
Branch-leaves oy large, the _ ones 2-3 mm., the upper 
uch as 6 mm. in length and 1-14 mm. wide, tmadiy Jancaoal 
aad the text ones almost tubular in ‘the upper part in consequence 
of the strongly inrolled margins; toothed at the narrowly truncate 
apex; border of 6-8 more rarely 10-15 rows of cells; when dry 
more or less (especially in the capitulum) undulate, somewhat 
and i t 
project Soaps in into the lumen of the cell; on the inner sur- 
face in the apical part almost quite without pores or with numerous 
smaller or ea non-ringed pores in almost every cell-angle; on 
the outer surface either only with very minute pores in the u 
and cence cell-angles, or sometimes also with completely or pone 
pletely bordered pores in the lateral cell-angles. 
Dioicous; — bracts much snalice than the other branch- 
aie frowns a@ narrower base broadly ovate-lanceolate, about 
1 mm. long and at ‘the base ‘57 mm. wide; hyaline cells towards 
the room of the leaf non- ibrillose or incompletely fibrillose. Upper 
he low 
perichetial leaves very larg ovate, concave, in the er part with 
chlorophyllose cells only, acs with both kinds of — hyaline 
cells very narrow, vermicular, generally non-fibrillose and non- 
rose, more rarely in the apical half on the outer pa with 
scattered small — in the upper cell-angles. Spores pale, about 
26-29 p» in diamet 
Chior “acorn eel in section broadly once ronaes to 
out 
the height of wae hyaline ones, in the upper half trapezoid and free 
on both surfac 
Hab. Floating or completely submerged in moorland pool 
Distrib, England; North America. Near Whitchurch, ies 
shire peels 
In swamps or partly immersed in water. Stem generally very 
robust and ee in stature 8. riparium; above green, yellow- 
ae or brow 
m-cortex -sheacolenie 2-3-layered and generally not clearly 
differentiated from the thick wood-cylinder; at times apparently 
os t. 
ft 
cleft; border much w — below; hyaline cells almost without 
a sor without 
Fascicles seecbiieg ‘ the habitat closer together or more dis- 
