363 
Fam. Oscillatoriaceae. 
Gen. Phormidium Kütz. 
Richter angiver Ph. laminosum Gom. (under Navn af Hypeothrix 
eloiophila [Kütz.] Rab.) fra Karajak Nunatak. 
Phormidium-Arter findes i Prover fra Unortok samlede af 
Jessen, men Materialet var desværre opbevaret i Spiritus, saa en 
Bestemmelse vil næppe give sikkert Resultat. Den tidligere omtalte 
Phormidium-Art fra en ,Sandslette foran Indlandsisen" var endnu 
daarligere bevaret, den havde Traade der var 1,3—1,9 u tykke, 
Skillevægge var utydelige, Skeder tynde og farveløse. 
Gen. Oseillatoria Vauch. 
1) 0. amoena Gom. — Gomont Tome 16 pag. 225 Pl. VII 
fig. 9. La. Fil. 5 vw: — Igaliko. (Vahl.) 
2) 0. brevis Kütz. — Gomont Tome 16 pag. 229 Tab. VII 
fig. 14. La. Fil. 4 w. — Fiskernæs. 
3) 0. chlorina Kütz. — Angives af Richter fra Umanak. 
Fam. Rivulariaceae. 
Gen. Calothrix Ag. 
C. parietina Thuret. — Bornet et Flahault Tome 3 pag. 366. 
La. Fil. 10—13 y. — Kingua Neriak, Kingua Sermiliarsuk. 
Den angives af Richter fra Karajak. 
Gen. Rivularia (Roth.) Ag. 
R. borealis Richter. — Angives af Richter fra Ikerasak. 
cells, the mucuos being less thick around the spores; the mucuos sheath 
is often constricted in such places where the vegetative cells come into 
contact with each other. The mucuos is colourless. The vegetative 
cells are globose and 9,7 x in diameter. The heterocysts are nearly 
globose and 10,4 w in diameter. The spores do not come into contact 
with the heterocysts, they occur singly or arranged in a series of a few 
together. The episporium is colourless and glabrous; length of spore 
30 z; breadth 10,4 ». At the spot where the spores come into contact 
with the vegetative cells the episporium is often shaped like a small 
cup, in which the vegetative cells occur. The colour of the filaments 
is somewhat faded, I belewe it had been pale blue-green. The cells 
contain numerous air-vacuoles. The thickness of the filaments, the 
mucuos sheath included, is 32 y. 
