355 



of lliem have been found bearing tetraspores making the resem- 

 blance still closer. When typically developed, Ch. virgatula is easiry 

 distinguishable trom Ch. secundata, but sometimes small specimens 

 of Ch. virgatula occur intermingled with the large Ch. virgatula and 

 linse small ones so closely resemble Ch. secundata as to suggest the 

 desirability of classing together the two species. On the other haml, 

 as they are easily to be distinguished when typically developed, 

 1 think Tor the present they ought to be kept distinet, 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, thougta 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 

 eonsists of several lavers of cells while in Ch. virgatula it often if 

 not arways (?) eonsists of one layer. 



This species was found on exposed coasts as well as in shel- 

 tered localities especially hetween tide-marks, but occurred also in 

 the sublittoral zone, and appears to be a common epiphyte on 

 larger algæ, e. g. Gigartina mamillosa, Rhodgmenia palmata, Himan- 

 thalia Lorea, Cgstoclonium purpurascens, Polysiphonia nigrescens, eta, 

 and on Zostera marina. 



Monospore-bearing piants 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 Færoes. 

 It was already found by Lyngbye, as a speeimen from Kvalbo which 

 he named Callithamnion Dawiesii is this species. It occurred in the fol- 

 lowing piaces: — Bord 6: near Klaksvig tetrasporic specimens on Cyslo- 

 clonium !); Str.: Velbestad on Gigartina mamillosa (!) ; Syd: Frodebo on 

 Himanthalia Lorea ! , Vaags Ejde likewise on Himanthalia (!). 



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, Kristian iafj ordens Algeflora p. 19, and 

 Kjellman, 1. c. tab. 12, figs 1 — 2). Dr. Rosen vinge, 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 hetween the 

 monospore-bearing specimens and those most commonly met with, 

 viz. the cystocarpic. Gobi (Algenfl. Weiss. Meer., p. 50) mentions 



Botany of the Færdes. 23 



