351 



is found both on sheltered and exposed shores, bul more commonly 



on the lalter. Specimens bearing monosporangia were met with 



from April to November, and mav doubtless be found all the year 



round. 



It was lirst found l)y Lyngbye and is very comraon everywhere. 



9. C. virgatula (Harv.) Thur. Le .lolis, Alg. mar. de Cherb., p. 106; 

 Kjellm., N. I., p. 166 (130). 



Some of the specimens which I have referred to this species 

 and one of which I have shown in lig. 52 approach most closely 

 to Trentepohlia virgatula Faiiow 

 in »Marine Algæ of New Eng- 

 land«, p. 109, tab. X, lig. 3. The 

 short branches bearing mono- 

 spores are very often opposite 

 and tliose in the upper part of 

 the plant especially terminate 

 in long hairs. Chromatophores 

 are star-like, as may distinctly 

 be seen in the young sporangia. 

 The cells in the long branches 

 are about 10 \i thick. 



Other specimens differed 

 from these in being almost 

 devoid of hairs, and only after 

 close examination were a few 

 branches found term inating in 

 hairs: these specimens which 

 were gathered near Velbestad 

 epiphytic on Gigartina mamil- 

 losa were further especially 

 noteworthy because they bore 

 both monospores and tetra- 

 spores. As is well-known, Har- 

 vey figures in Phycologia Brit., 

 pi. 313 a Callithanmion virga- 

 tulum bearing monospores as 

 well as tetraspores 1 , but as is 

 equally well-known this report 



Fijr. 52. Chantransia virgatula (Harv.) Thur. Portion of 

 filament with monospores (partly emptied). 100 : 1. 



1 and in the following plate he shows the same to be the case in Callithamnion 

 Daviesii. 



