504 



The specimens re ferred to this species had as observed by 

 Rosenvinge (1. c.) numerous cell-nuclei. The filaments were abont 

 30 — 60 /< thick, consequently, somewhat smaller than those des- 

 cribed by Ro sen vinge, the cells were about 2 — 5 times as long 

 as they were broad. 



Generally this species is recorded (e. g. by Kjellm. 

 1. c.) as lying loose at the bottom of shallow lagoons; 

 and Rosen vinge wriles with reference to it (1. c): - 

 »Usnally it is not attached«. In the Færoes I once 

 found some piants of it attached to stones in pools, 

 near high-water mark, in an exposed locality. The 

 base of these attached examples consisted of a rhizoid- 

 like cell which at the bottom widened into a small at- 

 tachment disc (lig. 102). Besides these specimens which 

 occnrred attached I found considerable quantities of it, 

 either lying loose in sheltered localities or entangled in 

 other algæ, e. g. Ahnfeltia plicata and Halosaccion ramen- 

 taceum and it is possible that it also grows partly at- 

 tached to the latter plant. 



With regard to its habitat Lyngbye writes (1. c): 

 — »Habitat ad littora Færoensia, imprimis supra sa- 

 Fig. io2. ciiæto- bulum, quod in sumrao refluxus limite saxa maritima 



morpha tortuosa 



(Diiiw.) Kieen. hic illic obducit, baud frequens; in sinu Qualboensi 



Baseofthe^Iant. alibique pass im«. 



Lyngbye has several specimens of this species in 

 his herbarium, but some of the piants under this name have, how- 

 ever, proved to be Rhizoclonium. 



Found in the following localities: — Bord 6: Klaksvig (!); Ost.: Ejde 

 (Lyngb.); Str.: east coast (Rostr.); Syd.: Kvalbo (Lyngb.), Suinbo Holm (!). 



RHIZOCLONIUM Kutz. 



184. Rh. riparium (Rolh) Harv. 1 . Rosenv., Grønl. Havalg., p. 913, 

 Deuxieme Mémoire; p. 103; Kjellm., N. I., p. 381 (311). 



var. pohjrhiza Rosenv. 1. c. Conferva obtusangula Lyngb., Hy- 

 drophyt., p. 159. 



1 For practical reasons, I have followed Rosenvinge's aomenclature and 

 nol tliat of Stockmayer given in his monograph: reber die Algengattung Rhizo- 

 clonium« (Verhandlungen der k. li. zool. botan. Gesellschaft in Wien, vol. XI, Wien 

 1890) which \\;is published before that of Rosenvinge, 



