243 



from the specimens in his herbarium, is identical with this species. 

 Gav (Algues vertes p. 86), who has examined the original specimens 

 in Thuret's Herbarium, has also determined it to be tliis species. 



264. P. velutina (Lyngb.) Wille. 



Lyngbye (Hydrophyt. p. 68) who first discovered and described 

 this species calls it Scytosiphon veliitiims Lyngb. With regard to its 

 habitat he writes: »Habitat ad saxa rivuh rapidissimi decUvia prope 

 Httus Øre Østeroe Færoense«. Alterwards Wille (1. c. p. 32) found 

 it in the material which he had for examination and which is 

 probably collected in the neiglibourhood of Kirkebo (Str.). 



265. Enteromorpha compressa (L.) Grev. Plate IX, figs. 3 and 4. 

 In Hydrophytologia p. 64 Lyngbye reports a freshwater example 



of Enteromorpha from the Færoes under the name of Scitosiphon 

 compressus (L.) Lyngb. (-i crispatns, and witli regard to its habitat 

 he writes: »Etiam in rivulo subalpino inter Welbestad et Kirkeboe 

 Færoæ; et ad littora Færoensia copiosissime«. I mention this here 

 because, as I shall show in the following, L^aigbye confounded 

 two different species under this name. How far this is the reason 

 why Agardh in »Till Algernes Systematik VI, Ulvaceæ« refers 

 Lyngbye's Scytonema compressus (i crispatns to two different species, 

 viz. E. prolifera (Miill.) p. 129 and E. percursa (C. Ag.) f. ramosa p. 147 

 and in both instances inserts a! after Lyngbye's figure l.c. tab. 15 B 

 fig. 1 — 2, I cannot tell; Agardh does not mention having had ori- 

 ginal specimens for examination. 



Wille (l.c. p. 57) is of opinion that Lyngbye undoubtedly has 

 confounded two species, and he adds »as it is not possible that a 

 saltwater species of Enteromorpha can also occur in a subalpine 

 stream«. He thinks that the freshwater form must be a Prasiola 

 fluviatilis (Somf.) Aresch. 



To this Simmons (Algologiska Notitser in Bot. Notitser 1898, 

 p. 27) remarks that Lyngbye's figure can hardly be made to fit 

 Prasiola fluviatilis and agrees with Agardh in thinking that the 

 species in question is an Enteromorpha prolifera. 



Fortunately in Lyngbye's Herbarium both fresh and saltwater 

 specimens are to be found. With regard to the latter I shall here 

 shortly mention that it can very well be referred to Enteromoi-pha 

 prolifera. Not quite so with the freshwater specimen. The example 

 found in the Herbarium of the Botanical Museum, Copenhagen, 



16* 



