F. Børgesen: Rhodophyceæ ol' the Danish W. Indies. 



397 



The tetrasporangia are produced in the cortical layer and 

 occur scattered over the whole thallus. They are about 20 fi broad 

 and cruciately divided (Fig. 379). Kuckuck gives (1. c, p. 223) 

 a transverse section of the wall with 

 tetrasporangia. 



The cystocarps are likewise found 

 scattered over the surface of the 

 thallus; they are hemispherical pro- 

 minent and have an apical porus. 

 Tetrasporangia and cystocarps oc- 

 curred in the month of March. 



At the islands this species has 

 been found in deep sea only (about 

 12 — 15 fathoms); according to Ber- 

 THOLD*) and Kuckuck (1. c, p. 218 

 — 19) it occurs too in shallow water 

 in the Mediterranean Sea. But it is 

 also found there in deeper water, 

 and Rodriguez**) found it even at a 

 depth of 130 m at the Baleares. 



St. Jan: In many places in the sound between this island and St. Tho- 

 mas and in the sea to the north of St. Jan. 



Fig. 380. Chrysymenia 

 Enteromorpha Harv. 

 (about natural size). 



Geogr. Distrib. 



Mediterranean Sea, Morocco. 



4. Chrysymenia Enteromorpha Harvey. 



Harvey, Nereis Bor.-Americana, Part II, p. 187. F. Børgesen, 

 W. I. Florideæ, II, p. 185. J. Agardh, Epicrisis, p. 325. 



Of this fine plant (Fig. 380) I have found a few specimens 

 in deep water. They reached a length of more than ten cms (in 

 the biggest specimen collected the basal part was absent). As des- 

 cribed by Harvey, the plant, to begin with, consists of a single sac- 

 cate oblong frond, two — three cms. long which at its base tapers 

 into a short stalk ending in a small disc, by means of which the 

 plant is fastened to the substratum. From this primary sac similar, 

 often narrower and longer, secondary sacs are issued in all direc- 

 tions, and these are again ramified in the same way and so on 



*) Berthold, G., Über die Vertheilung der Algen in Golf von Neapel etc., 

 p. 526. 

 **) Rodriguez, J., Algas de las Baleares, p. 254. 



