460 



varies considerably according to its habitat, are to be distinguished 

 in the Færoes. 



The forms referred to f. genuina somewhat resemble the figure 

 in the centre of fig. 88 which is taken from a small example, but 

 they are generally a little broader and have often a cordate base. 

 Some of the specimens had the upper part of the stem compressed 

 and consequently agreed with Kjell man's f. complanata. But in 

 the Færoes I have not come across specimens precisely similar 

 to Foslie's figures of f. typica in »Ueber die Laminarien Nor- 

 wegens« pi. 4 and 5, fig. 1, the stems of the Færoese specimens 

 especially being much shorter. To show the dimensions in f. ge- 

 nuina I give the following ineasurements: — 



Total length Length of stem Length of lamina Breadth of lamina 

 157 cm. 52 cm. 105 cm. 50 cm. 



200 cm. 25 cm. 175 cm. 55 cm. 



Some of the specimens referred to f. stenophylla were precisely 

 similar to Harvey' s above-mentioned figure, and had the lamina 

 divided into 2 — 3 segments only; others had the lamina split into 

 many quite narrow segments (see the two outside specimens in 

 fig. 88) thus agreeing most closely with Kjellman's f. cnneata (Handb., 

 p. 23). The Færoese specimens of this form were comparatively 

 small, those figured being, e. g. some 50 cm. long. 



The specimens referred to f. cucullata are noteworthy by their 

 lamina being more or less cucullate and being either divided into 

 only a few broad segments or being entirely whole; the lamina is 

 frequently very irregularly folded and waved, but in young specimens 

 it is sometimes almost smooth like Le J ol i s's f. ovata. Such a young 

 specimen isdistributed in Areschoug's Alg. scand.No. 167. The length 

 of the stipe also varies considerably, being sometimes short, some- 

 times long even longer than the lamina (f. longipes). In the Færoes 

 I found specimens precisely similar to those figured by Foslie (1. c). 



Formå stenophylla is generally met with in the littoral zone 

 and occurs on open sea-shores even in the most exposed situations. 

 Formå genuina grows in more sheltered localities in the sublittoral 

 zone or near extreme low-water mark. Formå cucullata occurs in 

 the sublittoral zone in the interior of fjords and is particularly 

 well-developed in piaces where the water is almost stagnant. F. 

 stenophylla and f. genuina generally grow on rocky bottoms; f. cu- 

 cullata especially on stony bottoms. 



