THE 
SCIENTIFIC PROCEEDINGS. 
OF THE 
ROYAL DUBLIN SOCIETY. 
se 
I. 
‘POGOTRICHUM HIBERNICUM, SP. N. By T. JOHNSON, 
D.Sc., F.L.8., Professor of Botany in the Royal College of 
Science, and Keeper of the Botanical Collections, Science and 
Art Museum, Dublin. Puare I. 
[Read NovemBer 16; Received for publication NovemBer 18, 1892; Published 
Marcu 25, 1893.] 
“arabe an algological visit to the west coast of Clare in 
September, 1891, I found growing on young A/aria plants, 
at low water on the Duggerna Rocks at Kilkee, brown tufts of 
filaments, which, on subsequent microscopic examination, appeared 
to be different from any plant with which I was acquainted. I 
sent some of the material to Professor Reinke, of Kiel, with an 
accompanying suggestion that the plant might be Litosiphon Lami- 
narie, Harv., a suggestion which was not adopted. My plant 
was, in Reinke’s opinion, a second species of a new genus, Pogotri- 
chum, of which the other species, P. filiforme,' collected at Heligo- 
land, had just been described by Reinke for his ‘“‘ Atlas deutscher 
Meeresalgen.” A proof plate of P. filiforme was kindly sent to 
me for comparison. The Kilkee plant agrees in so many features 
with the Heligoland plant that I propose to call it Pogotrichum 
hibernicum.? Reinke’s diagnosis of his genus Pogotrichum is as 
follows :— | | 
“ Unverzweigte, bischelformige, beisammenstehende, fadenfor- 
1J. Reinke, ‘‘ Atlas deutscher Meeresalgen,”’ 11. Taf. 41, 1892. 
27. Johnson, Irish Naturalist, No. 1, p. 5, 1892 
SCIEN. PROC. R.D.S., VOL. VIII., PART I. B 
