514 



formå contracta. Fruiting speciraens have been found from May 



to October. 



This species is very common along the Færoese coasts, as was 

 noted by Lyngbyer — »Ad insulas Færoenses, copiose«. It is fre- 

 quently covered with different epiphytes, e. g. Chantransia secundata, 

 Diatoms, etc. , a faet already observed by Lyngbye ns he writes: - 

 »Ad insulas Færoenses apices hujus Confervæ interdum fusci vel atro- 

 rubentis conspiciuntur coloris, qui ex porasitis minutis, nempe Calli- 

 thamnio Dawiesii, Diatomate marino, Fragilaria striatula &c. , quæ non- 

 nunquam copiose adsunt. originem ducit«. 



193. C. sericea (Huds.) Aresch. Phyceae Scand. mar., p. 194. 

 Cfr. Reinbold, Chlorophyceen der Kieler Fohrde, p. 135; Kuckuck, 

 Meeresalgen vom Sermitdlet- und kleinen Karajakfjord, p. 7. 



The specimens referred to this species generally fairly well 

 resembled those determined by Areschoug, and preserved in the 

 museum in Copenhagen, partly in the alga-herbarium, and partly 

 in Areschoug's Exsicc. The specimens in question are only a few 

 cm. in length and of a pale-green colour. The cells are elongated 

 from about double as long as broad, to 10 times as long as broad. 

 The main branches are about 75 — 100 — 170 ^ thick; the thinner 

 branches are 20 — 30 \i thick. In a plant preserved in spirit the 

 chromatophore was finely reticulated , with numerous pyrenoids. 

 The branches are generally distant, but frequently several spring 

 from the same joint; the branches of the last series often grow 

 somewhat unilaterally. The fruiting cells occur as shorter or longer 

 chains at the apex of the branches. 



I must, however, point out that among my material of this 

 species, forms occur, which other authors have referred to other 

 species of Cladophora, mostly to CL glaucescens and to certain forms 

 of the below species; and, on the whole, I am not quite certain 

 where and how the dividing line is to be drawn between this species 

 and the below one. At any rate I am impressed with the idea that the 

 difference in form is a result of the different habitats; in shellered 

 localities, e. g. in the interior of fjords and especially in high-lying 

 rock pools which receive a fresh supplv of water only when the 

 sea is very rough, i. e. perhaps in winter only, but where the water, 

 on the other band, even if it is somewhat heated by the sun, yet 

 is far from foul owing lo the larger size of the basin, in such lo- 

 calities such forms as I have referred to CL gracilis are found wbile 

 in low-lying rock pools wilhin reach of the lides and, consequently, 

 more exposed lo the force of the waves, small specimens, more 



