452 



and has generally no marginal area at all; on the other hånd, it 

 has sometimes a smooth, median stripe. The lamina is thick and 

 of a tough, leathery consistency. The Færoese specimens differ 

 from those mentioned by Kjell man in N. I., p. 287 (230) in ahvays 

 having a short stem whieh passes insensibly into the lamina. With 

 regard to the size of the specimens referred to this form the fol- 

 lowing measurements may serve as an example: — 



Length of plant Breadth of lamina Length of stem 

 2 metres 8 cm. 6 cm. 



1 metre 13 cm. 2 cm. 



The specimens referred to f. bullata are often larger and espe- 

 cially broader as they have a fairly distinct, strongly waved 

 marginal area. Two of the specimens which I measured were of 

 the following sizes: — 



Total length Breadth of lamina Length of stem 



2 m. 10 cm. 20 cm. 9 cm. 



2 m. 30 cm. 20 cm. 8 cm. 



Lastly, the specimens referred to f. grandis are marked by their 

 thinner and smoother or at any rate only slightly rugose lamina, 

 which can attain to a fairly great breadth and has generally a 

 rather distinct marginal area. With regard to the size of the spe- 

 cimens referred to this form the following measurements may serve 

 as a guide: — 



Total length Breadth of lamina Length of stem 



2 m. 35 cm. 13 cm. 



2 m. 15 cm. 37 cm. 4 cm. 



I have also referred a few large specimens which were found 

 growing in shallow water at the head of Trangisvaagfjord to this 

 form. The lamina was highly rugose and had a strongly waved 

 margin. The consistency of the lamina was in the middle, thick 

 and leathery; in the margin, thin and membranaceous. 



One speciinen measured as follows: — Length of lamina 2 

 metres; breadth 75 cm.; stem 5 cm. 



Formå linearis is met with in the most exposed situations, 

 e. g. on the south- western side of Sumbo Holm (Syd.); it occurs 

 here near low-water mark and sometimes beyond it. It answers 

 to f. slenophylla ol" Laminaria digitata. Formå bullata is found 



