390 
Tetrasporic specimens were found in June; plants from October to 
December consisted usually of the basal disc only, though sometimes 
they had a very few erect branches. 
It has been found in the following localities: — Vid.: Kvannesund 
(H. J.); Bor do: Haraldsund (H. J.); Str.: Kalbakfjord (!), Gliversnses (!); 
Syd.: Trangisvaag (H. J.). 
63. Rh. Rothii (Turt.) Nagl. Kjellm., N. I., p. 232 (185); Rosenv., 
Gronl. Havalg. p. 791; Callithamnion Rothii Lyngb., Hydropliyt. 
p. 129. 
f. typica. 
f. glohosa Kjellm. 
This plant, which is very common along the Faeroese coasts, 
varies considerably according to its different habitats. It occurs 
as a short, perfectly dense, and evenly spreading crimson covering 
on rocks and stones between tide-marks: most frequently in 
narrow rock-clefts; on the walls in the interior of caves; and in 
openings between tumbled down blocks of rock »Ur«; f. typica is 
most common in such localities. Forma globosa is met with on 
vertical rock-faces in much exposed localities from high-water mark 
to several feet above it; it is especially common on vertical rock- 
faces in caves, and on rocks with a northern aspect, where it oc¬ 
curs in small, semiglobular, very solid bodies, about the size of a 
pea, often growing more or less together and forming small irre¬ 
gular crusts. Judging from the following description of Lyngbye 
(1. c.) he has undoubtedly observed this form: — »Caespites minu- 
tissimi, 2—3 lineas alti, maxime gregariae, interdum ad latera rupium 
glomerulos durissimos formantes«. The lower part of the filaments 
were 17 y thick, higher up they become thinner, about 11 y. The 
cell-walls were often very thick, some I measured were as much 
as 3 y thick. When Kjellm an says that the lower articulations of 
f. globosa are almost as long as broad this does not correspond 
with the Faeroese specimens, the articulations of the latter being, 
also at the base, twice or thrice as long as broad. 
Forma typica varies considerably in thickness; general^ it is 
about 10 y thick, but I have often come across filaments measuring 
15 to 20 y ; in a single small example the filaments had even at¬ 
tained to a thickness of 29 y. It also appears to be a rule that 
the higher the plant grows above sea-level, or in other words, the 
more frequently and especially the longer it is left dry, the thicker 
the branches grow, as also the cell-walls. Rosenvinge (l.c.) reports 
