514 
forma contracta. Fruiting specimens have been found from May 
to October. 
This species is very common along the Fseroese coasts, as was 
noted by Lyngbye: — »Ad insulas Faeroenses, copiose«. It is fre¬ 
quently covered with different epiphytes, e. g. Chantransia secundata, 
Diatoms , etc., a fact already observed by Lyngbye as he writes: — 
»Ad insulas Faeroenses apices liujus Gonfervae interdum fusci vel atro- 
rubentis conspiciuntur coloris, qui ex porasitis ininutis, nempe Calli- 
thamnio Dawiesii, Diatomatc marino, Fragilaria striatula &c., quae non- 
nunquam copiose adsunt, originem ducit«. 
193. C. sericea (Huds.) Aresch. Phyceae Scand. mar., p. 194. 
Cfr. Reinbold, Ghlorophyceen 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-lierbarium, 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 g thick; the thinner 
branches are 20—30 g thick. In a plant preserved in spirit the 
chromatopliore 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 o*' 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 he 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 sheltered 
localities, e. g. in the interior of fjords and especially in high-lying 
rock pools which receive a fresh supply of water only when the 
sea is very rough, i. e. perhaps in winter only, but where the water, 
on the other hand, even if it is somewhat heated by the sun, yet 
is far from foul owing to the larger size of the basin, in such lo¬ 
calities such forms as I have referred to Cl. gracilis are found while 
in low-lying rock pools within reach of the tides and, consequently, 
more exposed lo the force of the waves, small specimens, more 
