505 
var. valida Fosl. Rosenv. 1. c. 
var. implexa (Dillw.) Rosenv. 1. c. Conferva iinplexa Lyngb., 
Hydrophyt., p. 144 (As proved by the specimens in his herbarium). 
The specimens referred to var. polyrhiza agree well with Ro- 
senvinge’s description and figures (1. c.). Now and then, though 
rarely, ramifications such as are seen in Lyngbye’s figure (tab. 55 B) 
occur in them. The plant attaches itself to rocks, etc. by its nu¬ 
merous multicellular rhizoids. 
The specimens referred to var. valida are about 30—40 y thick 
and the cell wall is about 3—5 y thick. The rhizoids are either 
not at all divided or by a few walls only. The plants which were 
all found at one station only, are gathered in rock-clefts as is also 
the case with Rosenvinge’s plants. 
The specimens referred to var. implexa have either a very few 
rhizoids or none at all, and these rhizoids when they do occur 
are not separated from the mother-cell by a wall. The filaments 
are about 30—40 y thick. 
This species is found on sheltered coasts as well as in exposed 
localities; it grows near high-water mark, and in places where the 
breakers rise high it may occur 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 ofVaago associated with 
Hildenbrandia rosea, Enteromorpha and a few other algae. It grew 
here in damp rock-clefts, and formed large, crisp, pale-green cushions 
on the rocks. Frequently it grows in places 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 Rliodochor- 
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 Fseroenses, rupibus declivibus maritimis in summo refluxus 
limite hie illic, ut ad Nses et Quivig Osteroe 1 , copiose adnata; etiam ad 
rupes maritimas, quse aqua dulci irrorantur, ut ad Nosocomium Arge 
prope Thorshavn«. Var. valida occurred near Glivernses (Str.) (!), and var. 
implexa in Sundelaget (!) north of Kvalvig; Syd.: Trangisvaag (!) and had 
been found by Lyngbye also (1. c.), who writes: — »Ad littora Fsero- 
1 »Osteroe« must be an error, as Quivig is on Stromo. 
