KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 20. N:0 5. 295 
Geogr. Distrib. Known only from the Norwegian Polar Sea. 
Locality: Nordlanden. I have collected it myself at Bodé. Possibly Kiren’s 
specimens are derived from the same place. 
Monostroma undulatum Wirrr. 
Monostr. p. 46. 
Deser. et Fig. Monostroma undulatum Wrrrr. |. c. et t. 3, fig. 9. 
Syn. Monostroma undulatum Kuren, Nordl. Alg. p. 41. 
Ulva lactuca Sommerr. Suppl. p. 185; see. syn. 
» » We. Fl. Lapp. p. 507; sec. spec. 
Habitat. Found on the upper part of the sublitoral zone, attached to Corallina 
officinalis. 
Geogr. Distrib. Known only from the Norwegian Polar Sea. 
Locality: Nordlanden at Kjerring Isle according to specimens in Wahlenberg’s 
herbarium. 
Monostroma lubricum KJrenuom. 
Spetsb. Thall. 2, p. 48. 
Descr. et Fig. Monostroma lubricum Ksetum. |. ec. et t. 4, fig. 8—9. 
Syn. Monostroma lubricum Gost, Algenfl. Weiss. Meer. p. 79. 
The habitat-of this species is unknown. Cp. Ksriim. |. ec. 
Geogr. Distrib. It belongs to the arctic region of the Polar Sea, where it is 
found at several places. Its most northern point is Fairhaven on the north-west coast 
of Spitzbergen Lat. N. 79° 49. 
Localities; The Greenland Sea: Fairhaven. 
The Murman Sea: Sviatoi Noss on the coast of Russian Lapland. 
baffin Bay: the west coast of Greenland at Kakortok Bay according to specimens 
in the herbarium of Copenhagen Museum. 
Monostroma cylindraceum nob. 
M. thallo initio sacculum subeylindraceum, tenuem, flaccidum, flavescentem, bullosum, usque 10 em. 
longum diametro 3—4 em. formante, demum libero, rima longiore vel breviore exorta plus minus expanso, vix 
laciniato; parte monostromatica vegetativa 40—45 wu. crassa; corpore chlorophylloso lumen cellulare in sectione 
thalli transversa qvadratum vel rectangulare, 10—15 w. altum non vel fere explente; parte zoosporifera e cellulis 
lumine cellulari in sectione transversa thalli elliptico vel circulari constructa. ab. 30. 
Description. ‘The present alga is attached by a callus radicalis. The frond has 
at first the shape of an almost cylindrical sack, uneven and bullate on the surface, 
attaining a length of 10 cm. by 3—4 cm. in diameter, very pale green or yellowish 
green in colour, feebly or not at all shining, of loose consistency, and _ so slimy that it 
adheres strongly to the paper in drying. At last a reft is formed at the top, stretching 
more or less far downwards, sometimes nearly to the base, the frond expanding at the 
