480 
the receptacles being often more irregularly formed and sometimes 
swollen, and the colour of the plant being of a paler yellow. 
It was found hearing young receptacles in April and May, and 
the receptacles reached their highest degree of development (1—IV 2 
metres long) during summer, and contained ripe oogonia from July to 
September. Kjellman (l.c. p.194) says that according toWahlen- 
berg H. lorea is not to be found during winter in Lapland which 
does not agree with what happens along the Fseroese coasts. Here 
according to my observations the plant is »hapaxantliic«. I think 
the oogonia germinate immediately in autumn and develop during 
winter into the well-known button-shaped plants which are often 
ovately swollen. In my experience the latter can live several years 
without fructifying, and this appears to be more particularly the 
case when growing nearer high-water mark than is natural to the 
plant. It is undoubtedly necessary for the young plant to attain 
to a certain size and vigour in order to be able to bear fruit; those 
growing in favourable habitats probably arrive at perfection during 
the winter, others which are less fortunate keep on living for several 
years and such older plants are easily recognizable by their darker 
colour and their more leathery consistency as also by the numerous 
epiphytes which gradually occur on them. Some of these older 
plants are perhaps able to fructify later on, others, growing in the 
most unfavourable habitats, are never able to do so and eventually 
die. When the plant has fructified it dies away gradually, but the 
conical lower part and a portion of the receptacles can keep fresh 
doubtless for several years and form a favourite habitat especially for 
species of Ectocarpus, but they can hardly produce new receptacles. 
This is an extremely common species of the Fseroese coasts as was 
reported by Lyngbye, who writes: — »Ad insulas Fseroenses copiose, 
non solum in fundo, sed etiam in summo refluxus limite«. This species 
was first mentioned by Landt, l.c. p.228. 
C. Chlorophyceae. 
Order PLEUROCOCCOCEAE. 
PLEUROCOCCUS Menegh. 
157. PI. spec. Palmella adnata Lyngb.,Hydrophyt.,p.205,tab.69A. 
On examining Lyngbye’s specimens of Palmella adnata which 
are preserved in his herbarium in Copenhagen they proved to be 
