Report of Fauna and Flora Committee — Irish Phceophycece. 4L^b 



f. fragilis. 



This variety was recorded by Harvey from Kilkee. 

 Harvey's Dictyosiplion fragilis'M.B. is adopted by Kiitzing in 

 his " Systema Algarum." The sporangia are collected in 

 clusters as in Striaria, but not in transverse bands. It differs 

 somevi'lmt horn JD. fcem'ciilaceus. "West of Ireland. 12. 

 D. Mppuroides, Kiitz. 12 IST. 



Order III. — Punctaeiace^. 



Xiitosiplion, Harv. 



The unilocular and plurilocular sporangia are described in 

 the " Etudes Phycologiques," p. 15. 

 L. pusillus, Harv. 



Common, on all coasts, as fine tufts on the thallus of Chorda 

 jilum. 



L. Laminarice, Harv, 



This species grows on Alaria esculenta, Grev., and is not 

 uncommon, on all coasts. 



Pogotrichum, Eke. 



P.filiforme, Eke. 10 jS". 



This species grows epiphytically on Lannnaria- saccliarina^ 

 and is probably to be found on all the Irish coasts. 



P. hihernicum, T. J. UN. 



Grows on Ataria esculenta, and is probably, like P. fillforme, 

 Eke., to be found on all the Irish coasts. 



Phloeospora (Aresch.}, Eke. 



P. hrachiata (Harv). Born. (Stictyosiphon Grifiithsianus, Holm, 

 et Batt : Ectocarpus Irachiatus, in Phyc. Brit. PL iv.) 



This species grows on Rhodtjmenia palmata and Fucus 

 serratus and occurs on the south and east coasts (probably 

 elsewhere). It possesses unilocular sporangia only. Its 

 branching filamentous thallus shows tricho-thallic growth, 

 growing by intercalary acropetal divisions. At the base and 

 here and there only in the general thallus is there a poly- 

 siphonous or multiseriate arrangement of the cells. The 

 terminal hair of the branches is equal in diameter to the 

 "central axis" of the branch, and not much less — as in 

 Stictyosiphon tortiUs. Eko. 



