No. 11.] THE BRYOPHYTES OF CONNECTICUT. 
Io. 
II. 
12. 
Chlorophyll cells elliptical, spindle-shaped, or rectangular 
in cross section, not triangular or trapezoidal (except in 
S: dasyphyllum) vss os ccieeeg Sees dave eos te ease Rana ces 
Base toward the inner surface of the leaf; hyaline cells 
strongly convex toward the outer surface; branch leaves 
erect (ACUTIFOLIA, p. 83)......... cc cece cece eee e eee avis 
77 
20 
5 
Base toward the outer surface of the leaf; hyaline cells 
usually strongly convex toward the inner surface...... 13 
Stem leaves lacerate-fringed at the broadly rounded apex, 
Without ABMIS: se ccu seeds gene ee eel + onawas Oh Ba oe ew 6 
Stem leaves more or less truncate and toothed at the apex, 
not fringed wees sss yep ede 295 Basa se Waele onan eds 7. 
Stem leaves broadened above, spatulate, apex and upper 
margins fringed; monoicous ...............-- S. fimbriatum 
Stem leaves not broadened above, lingulate, fringed only 
at the apex; dioicous ............. cece ee eee S. Girgensohnii 
Stem leaves lingulate, fibrils anally absent, though some- 
_ times present in the upper part of the leaf.............. 8 
Stem leaves triangularly lingulate to equilaterally tri- 
angular, uSually with fibrils .................. Ravwwaneenetones Io 
Plants usually red, never brown............eceeceeeeeees 9 
Plants usually brown, never red; pores as in S. Warnstorti; 
stem leaves without fibrils....................06. S. fuscum 
Pores present on outer surface of the branch leaves, small, 
round, and situated in the cell angles; stem leaves with- 
Out fibrils: ¢ sdsecesuacesaeeweta den’ scat aea S. Warnstorfii 
Pores present on outer surface of the lower branch leaves, 
large, more or less semicircular, and situated along the 
lateral margins of the cells; stem leaves frequently with 
AibTils:<.cs43ilees Sotindwaeenees cate Sookie ee S. rubellum 
Branch leaves when dry distinctly 5-ranked; outer wall of 
cortical cells in stem often with irregular pores in the 
upper ends of the cells................005. S. quinquefarium 
Branch leaves when dry not arranged in distinct rows.... II 
Stem leaves with fibrils and pores; branch leaves not 
glossy ‘when. dry ssi os sais essen eu sews dod aignaas wade 12 
Stem leaves mostly without fibrils or pores; branch leaves 
glossy when dry; cortical cells of stem seldom with 
pores; hyaline cells of stem leaves usually 2-6-septate 
S. subnitens 
Outer wall of cortical cells in stem often with irregular 
pores in the upper ends of the cells; hyaline cells of 
stem leaves not divided, or, if so, uniseptate..S. acutifolium 
Cortical cells in stem without pores; hyaline cells of stem 
leaves copiously divided by oblique walls....... S. tenerum 
