481 



a gathering of a great many different algæ, e. g. Calothrix scopulorumj 

 some very Ihin Oscillariaceæ, fragments of Ulothrix, Porphyra, etc; 

 and further, a small, unicellular, yellowish alga, which occurred 

 abundantly in the gatherings and is presumably tlial which Lyngbye 

 calls Palmella adnata, as I think it must be tliis alga to which he 

 refers when he writes in his diagnosis: »granulis internis globosis, 

 fuscis«, and in Descript. : »granula intra substantiam lutescentem 

 minuta, globosa, fusca«. 



Judging from the material in hånd, Ihe cell contents are of a 

 yellowish colour, which corresponds to Lyngbye's description. As 

 far as I can see, the chromato- 



phores consist of one or more Æk ø\ fr\ /y\ f°x 

 parietal piates (lig. 98); some of ( '" g) W (JJ O 



the cells contained one or two 



, . , . i ,i i Fig. 98. Pleurococcus spec. 300:1. 



lai riv large pyrenoids, tlie en ro- 

 matophores being generally arranged around the latter somewhal 

 in the form of a star. The cells are almost oval, and are ahout 

 11 — 12 /< long and 5,5 — 7 /< broad. They are divided sometimes 

 by transverse and sometimes by longitudinal walls (fig. 98). 



I think tliis alga may qnite naturally be referred to the genus 

 Pleurococcus. I have preferred not to give it a name, as it appcars to 

 me that Hudson's name adnata can hardly he used, for, his original 

 examples not being availahle for reference, and his description being 

 shorl, it is very difficult to decide which plant he w;as describing, and 

 moreover, later authors (Nægeli, Berkeley) have referred his plant 

 to the genus Gloeocystis. Further, I have preferred to call it Pleurococcus 

 sp. as it appears to me highly probable that the Protococcus ovalis 

 described by Hansgirg in Foslie's »Contribution« I, p. 159, is 

 identical with the Pleurococcus in question. Hansgirg gives no 

 reasons for calling his plant Protococcus, and his description and 

 ligures as a whole are not exhaustive enough for comparison. 



With regard to its occurrence along the coasts of the Færoes 

 Lyngbye Le. writes: — »Habitat ad rupes maritimas declives Færoenses, 

 inter Thorshavn et Hoyvig in superiore refluxus limite, rarior«. 



Order PROTOCOCCACEAE. 



C II LOROCH YTR I U M Cohn. 



158. Ch. inclusum Kjellm., N. I., p. 392 (320), lab. 31, ligs. 8—17; 

 Rosenv., Grønl., Havalg., p. 963. 



The Færoese examples appear lo be precisely similar to Kjell- 



