Pogotrichum and Litosiphon. 
463 
P.Jiliforine. 
P. hibernicum. 
L. pusillus. 
L. Laminariae. 
1. Tufts of unbranched 
filaments in all. 
Tufts of unbranched 
filaments in all. 
Tufts of unbranched 
filaments in all. 
Tufts of unbranched 
filaments in all. 
2. Filaments naked. 
clothed with hairs. 
ditto. 
ditto. 
3. Epiphytic on Lamin- 
aria saccharina. 
Endophytic in 
Alaria esculenta. 
Epiphytic on Scyto- 
sipkon and on 
Chorda. 
Endophytic in 
Alaria esculenta. 
4. Filaments mostly 
monosiphonous or 
one-cell-seriate. 
Mostly polysiphon- 
ous. 
ditto. 
ditto. 
5. Filaments isospor- 
angiate. Plurilocu- 
lar sporangia only 
known. 
Filaments isospor- 
angiate. Plurilo- 
cular sporangia 
known. 
ditto 
1 -locular sporangia 
only known. 
Filaments anisospo- 
rangiate. 1 -locular 
and plurilocular 
sporangia known. 
The Laboratory, Glasnevin. 
