383 



of this peculiarity the Færoese specimens agreed with C. corgmbosum 

 var. amphicarpa, Thur., to which variety they also in other respects 

 bear a ralher close resemblance. But as I 

 was nol quite sure that the Færoese spe- 

 cimens could he placed under var. amphi- 

 carpa Thur. I sent an example of the 

 Færoese plant to Dr. Bornet who very 

 kindly lells me that he is of opinion that 

 it approaches closely to the variety in ques- 

 tion, the only difference being that the 

 Færoese specimen has short-slalked as well 

 as sessile tetraspores intennixed 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-étre pas une grande 

 valeur.« I therefore refer the Færoese 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- 

 spores. 



Found in June as an epiphyte in about 

 8 fathoms of water near Ore on Ost. (!). 



As pointed out by Rostrup (1. c. p. 85), Hornemann in Dansk 

 oeonomisk Plantelære, second edition, vol. 2, p. 679 reports Callithamnion 

 eorijmbosum from the Færoes, and a specimen labelled in Hornemann's 

 handwriting >e Færoe« 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. 



Fig. 58. Callithamnion uranulatum 



(Duel.) Ag. var. amphicarpa Thur. 



Portion of branch with tetraspores 



and young cystocarps. 70 : 1. 



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 Florideæ. 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 



