383 
of this peculiarity the Faeroese specimens agreed with C. corymbosum 
var. amphicarpa , Thur., to which variety they also in other respects 
bear a rather close resemblance. But as I 
was not quite sure that the Faeroese spe¬ 
cimens could be placed under var. amphi¬ 
carpa Thur. I sent an example of the 
Faeroese plant to Dr. Bor net who very 
kindly tells me that he is of opinion that 
it approaches closely to the variety in ques¬ 
tion, the only difference being that the 
Faeroese specimen has short-stalked as well 
as sessile tetraspores intermixed on the 
same plant, while the Cherbourg specimens 
— according to Dr. Bornet — has only 
sessile sporangia. But Dr. Bornet adds: — 
»Ce caractere n’a peut-etre pas une grande 
valeur.« I therefore refer the Faeroese spe¬ 
cimens to Thuret’s variety. Fig.58 shows 
a branch of the plant bearing young cysto- 
carps as well as stalked and sessile tetra- Fig 58 Calmhamnlon granuIatum 
SpOreS (Duel.) Ag. var. amphicarpa Thur. 
Portion of branch with tetraspores 
Found in June as an epiphyte in about and young cystocarps. 70.1. 
8 fathoms of water near Ore on Ost. (!). 
As pointed out by Rostrup (1. c. p. 85), Hornemann in Dansk 
oconomisk Plantelaere, second edition, vol. 2, p. 679 reports Callithamnion 
corymbosum from the Faeroes, and a specimen labelled in Hornemann’s 
handwriting »e Faeroe« also exists in the museum in Copenhagen. Horne¬ 
mann, however, does not give his authority for this report, and as 
Lyngbye does not mention this species in Hydrophyt. the above report 
is probably due to a confusion. 
PLUMARIA (Stackh.) Schmitz. 
54. PI. elegans (Bonnem.) Schmitz. Ptilota elegans Bonnem., 
Kjellm., N. I., p. 217 (172). 
This is a littoral species and grows on exposed coasts in caves 
and dark rock-clefts, often associated with Delesseria alata, Calli- 
thamnion scopulorum and other Floridece. It grows gregariously 
and often occurs as fairly large, pure societies somewhat above 
low-water mark, appearing at ebb-tide as a covering of a dark, 
brownish-red colour clinging tightly to the rock. The specimens I 
examined had only borne cystocarps, they occurred in May and 
