122 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



and figures I must refer for details. The few trichogynes I have 

 seen seem to be somewhat longer than those drawn by Bornet 

 and Zerlang. 



The tetraspores, antheridia and cystocarps occur in separate 

 individuals ; these organs were found in the months of February 

 and March. 



This species seems to be common in the sublittoral region 

 down to a depth of about 30 meters and is found as an epi- 

 phyte upon larger algæ, e. g. Caiilerpa, Penicillus, Udotea etc. 



St. Croix: Near Buck Island. St. Jan: in many places in the sound 

 between this island and St, Thomas. 



Geogr. Distrib.: Mediterranean Sea; the warmer parts of the Euro- 

 pean and American coasts of the Atlantic. 



II. Cryptonemiales. 



Fam. 1. Grateloupiaceæ. 

 Halymenia C. Ag. 



1. Halymenia Floresia (Clem.) Ag. 



Agardh, C, Spec. Ag. I„ p. 209; Systema, p. 243. Agardh, J., Alg. 

 Mediterr. & Adriat., p. 96; Spec. Alg., II., p. 205; Epicrisis, p. 138. Kützing, 

 Spec. Alg., p. 716; Tab. Phycol, vol. 16, pi. 88—89. Harvey, Nereis Bor.- 

 Am., vol. II, p. 193. Berthold, Die Cryptonemiaceen des Golfes von Neapel 

 (Fauna und Flora des Golfes von Neapel, XII. Monographie, 1884). 



Fucus Floresius demente, Ensajo sobre las variedades, 1807, p. 312. 



Turner, Fuci, pl. 256. 



Of this species I have collected a few specimens some 

 of which are rather large reaching a length up to 40 cm. They 

 are all very much ramified and compared with the specimens 

 distributed in Phycotheca Bor. -Am., Nr. 298 thinner and flab- 

 bier and of a paler rosy colour. This is most probably due to 

 their development in rather deep water. On the other hand my 

 plants are much like a specimen from Jupiter Inlet, Florida, 

 collected and most kindly sent to me from Mrs. G. A. Hall. 



Halymenia Floresia is fixed to the substratum by means of 

 a small disc. Immediately above this the thallus is terete, but 

 it very soon becomes flattened and passes evenly over into the 



