505 



var. valida Fosl. Rosen v. 1. c. 



var. implexa (I)illw.) Rosenv. 1. c. Conferva iraplexa Lyngb., 

 Hydrophyt., p. 144 (As proved by the specimens in his herbarium). 



The specimens referred lo var. polyrhiza agree well with Ro- 

 senvinge's description and lignres (1. c). Now and then, thongh 

 rarely, ramifications such as are seen in Lyngbye's ligure (tab. 55 15) 

 oecur in them. The plant attaches itself lo rocks, etc. by ils nu- 

 inerous multicellular rhizoids. 



The specimens referred lo var. valida are about 30 — 40 ju thick 

 and Ihe cell wall is about 3 — 5 \i thick. The rhizoids are eilher 

 not at all divided or by a few walls only. The piants which were 

 all (bund at one station only, are galhered in rock-clefts as is also 

 the case with Ro se uvinge 's piants. 



The specimens referred to var. implexa have eilher a very few 

 rhizoids or none at all, and these rhizoids when they do oecur 

 are not separated from the mother-cell by a wall. The filaments 

 are about 30—40 n thick. 



This species is found on sheltered coasts as well as in exposed 

 localities; it grows near high-water mark, and in piaces where the 

 breakers rise high it may oecur at about 30 — 40 feet above sea-level, 

 and has even been found at a height of about 80 feet above sea-level 

 near the exit of Bosdalafos on the west side of Vaago associated with 

 Hildenbrandia rosea, Enteromorpha and a few other algæ. It grew 

 liere in damp rock-clefts, and formed large, crisp, pale-green enshions 

 on the rocks. Frequently it grows in piaces where fresh-water 

 drips down from above or oozes out of clefts in the rocks. Var. 

 implexa also grows on the ground associated with Vaucheria coro- 

 nata and Percursaria percursa ; and var. valida was observed in 

 rock-clefts on rather exposed coast and associated with Rhodochor- 

 ton Rothii. 



Var. polyrhiza is common, and as mentioned above, had been found 

 by Lyngbye, who (1. c. p. 159) writes with reference to it: — »Habitat 

 ad insulas Færoenses. rupibus declivibus maritimis in summo refluxus 

 limite hic illic, ut ad Næs et Quivig Osteroe 1 , copiose adnata; etiam ad 

 rupes maritimas, quæ aqua dulci irrorantur, ut ad Nosocomium Arge 

 prope Thorshavn«. Var. valida occurred near Glivernæs (Str.) (!), and var. 

 implexa in Sundelaget (!) north of Kvalvig; Syd.: Trangisvaag (!) and had 

 been found by Lyngbye also (1. c), who writes: — »Ad littora Færo- 



1 »Osteroe« must be an error, as Quivig is on Stromo. 



