Contribution. I. 127 



Gen. Prasiola (Ag.) Jess. 

 1. c. Ag. Spec. Alg. 1, p. 416; char. mut. 



Prasiola furfuracea (Mert.) Menegh. 

 Cenni p. 36; Ulva furfuracea Mert. in Fl. Dan. t 1489. 

 Descr. Prasiola furfuracea Lagerst. Monogr. p. 31. 

 Fig. „ „ Grev. Alg. Brit. t. 18. 



„ „ Jess. 1. c. t. 2, fig. 1 — 10. 



„ „ Lagerst. 1 c. fig. 3. 



Exsicc. „ „ Aresch. Alg. Scancl. exsicc. Nr. 221. 



„ „ Wittr. et Nordst. Alg. exsicc. Nr. 49, 438, 642. 



At East-Finmarken I three times met with this species 

 growing on rocks as far down on the sea-shore that it al- 

 most constantly was washed over by the waves, or at or a 

 little above high-water mark, in the same hight as Rhizo- 

 clonium riparium and Enteromorpha micrococca. Cp. Wittr. 

 et N o r d s t. Alg. exsicc. Nr. 642. Sometimes it grows si- 

 de by side or even together with P. stipitata. Cp. Wittr. 

 et N o r d s t. 1. c. Nr. 435 and 438. 



Distribution: Found at Mehavn, Vardo and Pasvig. I 

 have also seen it at several other places, but at some di- 

 stance from the shore. 



Prasiola Lenormandiana Suhr 



see. Jess. Monogr. p. 17. 

 Descr. Prasiola leprosa Lagerst. Monogr. p. 33. 

 Fig. „ ., Jess. Monogr. t. 2, fig. 17—23. 



Exsicc. „ „ Wittr. et Nordst. Alg. exsicc. Nr. 643. 



Syn. Prasiola leprosa Rabenh. Fl. Eur. Alg. 3, p. 309; non. Kiitz. 



I agree with L a g e r s t e d t (1. c.) regarding this 

 plant a separate species. I at least never saw any transi- 

 tion to P. furfuracea^ though it rather much reminds of 

 that species. It is distinguished from the latter especially 

 by its smallness and the shape of the frond, and it appears 

 to me to be pretty well differentiated. As the description 

 of P. leprosa Kiitz. in Phyc. germ, and Spec. Alg. refers 



