396 
I cannot exactly say, but it may doubtless be presumed to grow 
at a height of several metres, more particularly in the interior of 
the large caves which occur so frequently along the exposed coasts 
of the Faeroes. Thus, I saw in one of the large caves (at least 20 
metres high) at Troldhoved, large, reddish-purple patches, far up 
on the walls and on the roof of the cave, which were undoubtedly 
this alga; in a small cave near Kvalbo on Sydero it occurred as a 
dense covering on the roof which was just within reach. 
In the sublittoral zone I have only found it epiphytic on La¬ 
minaria, but Kj ell man says that in the Polar Sea he came across 
it in the latter zone both on stones and algae. It has been found 
down to a depth of some 10 fathoms. 
I found a small number of specimens in June and July which 
were still bearing a few tetraspores, but the greater part of them 
had fallen off. The rest of the specimens gathered from April to 
August were sterile. On the other hand, specimens rich in tetra¬ 
spores were found in November and December. Thus, as along 
the Danish coasts so also along the Faeroes the period of fructifi¬ 
cation falls undoubtedly during the winter months, though the alga 
is sometimes found bearing tetraspores far into the summer. In 
Iceland Jonsson found a few tetrasporic specimens in the spring 
and summer; and Kjellman is of opinion that at Spitzbergen the 
tetraspores are formed in May and June. 
The frequent occurrence of this species along the Faeroese coasts 
was also noted by Lyngbye, who writes: — »Habitat ad rupes abruptas 
insularum Faeroensium in summo refluxus limite, copiose; imprimis 
autem ad stipitem Laminariae digitatae. ibidem«. 
64. Rh. seiriolanum H. Gibson. On the Development of the Spo¬ 
rangia in Rhodocliorton Rothii Nag., and Rh. floridulum Nag., and 
on a new Species of that Genus (Journ. of the Linnean Society. Bot. 
vol. 28, 1891, p. 204). 
Only a small quantity of this species was found epiphytic on 
Ceramium acanthonotum associated with Chantransia secundata. It 
occurred on exposed coast near high-water mark. 
Tetrasporic specimens occurred in April. 
Found hitherto only on Str.: Velbestad (!). 
