114 M. Foslie. 



Monostroma latissimum (Kutz.) "Wittr. 



Monostr. p. 33; Ulva latissima Kiitz. Phyc. gener. p. 296. 

 Dwcr. Monostroma latissimum Wittr. 1. c. 

 Fig. „ „ „ „ t. 1, fig. 4. 



Exsiec. „ „ Wittr. et Nordst. Alg. exsicc. Nr. 145. 



Of this species I have only met with a solitary speci- 

 men, picked up by the dredge from a depth of about 10 

 fathoms, and probably having lain loose on the bottom. It 

 is 8 cm. long and 6 cm. broad. 



Distribution: Found at Kjollefjord, a single specimen. 



Monostroma undulatum Wittr. 

 Monostr. p. 46. 



f. typica nob. 

 Descr. Monostroma undulatum Wittr. 1. c. 

 Fig. „ „ „ „ t 3, fig. 9. 



f. larlowii nob. 

 Descr. Monostroma pulchrum Farl. New. Engl. Alg. p. 41. 

 Syn. Ulva lactuca Wg. Fl. Lapp. p. 507. 



I have seen a pretty large number of a Monostroma be- 

 longing to the same section as M . latissimum with the frond 

 membraneously expanding even in a young state. It corre- 

 sponds well with W i 1 1 r o c k's description of M. undulatum 

 except with regard to the structure in the monostromatic 

 part of the frond. But as other species of the genus are 

 rather much varying also in reference to the structure, for 

 inst. M. arcticum and Jf. saccodeum, I think it may be re- 

 ferred to the present species. I regard it the typical form. 

 I also met with a few specimens of another Monostroma 

 which coincide well with M. pulchrum Farl., but, on the 

 other side, so nearly related to M. undulatum that no limit 

 hardly can be drawn between them, and, therefore, I keep 

 it a form of the latter, and propose to call it f. larlowii. 



The typical form is ovale, ovate-lanceolate, or lanceolate, 

 mostly broadest in the lower part of the frond and from there 



