355 
of them have been found bearing tetraspores making the resem¬ 
blance still closer. When typically developed, Ch. virgatnla is easily 
distinguishable from Ch. secundata, but sometimes small specimens 
of Ch. uirgatala occur intermingled with the large Ch. virgatnla and 
these small ones so closely resemble Ch. secundata as to suggest the 
desirability of classing together the two species. On the other hand, 
as they are easily to be distinguished when typically developed, 
I think for the present they ought to be kept distinct, in which 
opinion I am supported by Dr. Kuckuck. Ch. secundata is espe¬ 
cially distinguished by its small size, its short cells and its branches 
which are for the most part secund, though opposite branches also 
occur, while in Ch. virgatula the branches are almost as often oppo¬ 
site as secund. Lastly, the basal disc in Ch. secundata generally 
consists of several layers of cells while in Ch. virgatula it often if 
not always (?) consists of one layer. 
This species was found on exposed coasts as well as in shel¬ 
tered localities especially between tide-marks, but occurred also in 
the sublittoral zone, and appears to be a common epiphyte on 
larger algae, e. g. Gigartina mamillosa , Rhodymenia palmata, Himan- 
thalia Lorea, Cystoclonium purpnrascens, Polysiphonia nigrescens , etc., 
and on Zostera marina. 
Monospore-bearing plants were found in April, June and July, 
tetrasporic in April, May and June. 
This species appears to be rather common along the coasts of the Faeroes. 
It was already found by Lyngbye, as a specimen from Kvalbo which 
he named Callithamnion Dawiesii is this species. It occurred in the fol¬ 
lowing places: - Bordo: near Klaksvig tetrasporic specimens on Cysto¬ 
clonium (!); Str.: Velbestad on Gigartina mamillosa (!); Syd: Frodebo on 
Himanthalia Lorea (!), Vaags Ejde likewise on Himanlhalia (!). 
10. C. efflorescens (J. Ag.) Kjellm., N. I., p. 166 (129). 
I have only seen a few individuals of this species, and they 
occurred bearing monospores only. Generally they are found only 
with cystocarps (cfr. Gran, Kristianiafjordens Algeflora p. 19, and 
Kjellman, 1. c. tab. 12, figs 1—2). Dr. Rosenvinge, however, who 
has seen my specimens, tells me that along the Danish coasts 
he has found monospore-bearing specimens, which exactly resemble 
mine; and he also tells me that with the help of his material he 
will be able to prove with certainty the relationship between the 
monospore-bearing specimens and those most commonly met with, 
viz. the cystocarpic. Gobi (Algenfl. Weiss. Meer., p. 50) mentions 
Botany of the Faeroes. 
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