302 



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



in its favourite growing places: dark ravines 

 etc. It has been found with tetraspores and 

 cystocarps in the month of January. 



St. Croix: The harbour ot Christiansted and 

 the lagoon at the same town; Salt River Lagoon. 

 St. Tomas: St. Nordsidebugt. St. Jan: Cruz Bay. 



Geogr. Distrib. : Widely distributed in all 

 warmer seas. 



Subfam. 7. Lophothalieæ. 

 Lophocladia Schmitz. 



1. Lophocladia trichoclados 



(Mert., C. Ag.) Schmitz. 

 Fr. Schmitz, Die Gattung Lophothalia (Ber. d. 

 deutsch, bot. Ges., Bd. XI, 1893, p. 222). Falken- 

 berg, P., Rhodomelaceen, p. 653. 



Conferva trichoclados Mert. mscr. 

 Griffiihsia trichoclados Ag., Spec Alg., II, 1828, 

 p. ]32. 



Dasya lophoclados Mont, in Ann. Sc Nat., Bot., 

 II. sér., 1842, p. 254; Harvey, Nereis Bor.-Am., II, 

 p. 65. 



Polysiphonia lophoclados Kiitz.. Spec. Alg., p. 

 834; Tabulae Phycol. XIV, tab 22, fig. a— b. 



Dastfa trichoclados J. Ag., In Historiam Alga- 

 rum Symbolæ, Linnæa, vol. 15, 1841, p. 32; Spec. Alg., vol. II, p. 3, p. 1229. 

 Lophothalia (Lophocladia) trichoclados J. Ag., Till. Algernes Systematik, 

 XI, Florideæ, p. 64. 



The figure (Fig. 304) shows the summit of a filament. From 

 the large apical cell disc-formed segments are cut olT. From these 

 the trichobiasts soon grow out, before they are yet divided, the 

 segments being divided rather late into a central 

 and four pericentral cells. Also in the trichobiasts 

 transverse walls are developed rather late. 



The trichobiasts are placed in a screw turning 

 to the left with a divergency of Vi, one from 

 each segment (Fig. 305). They are monosiphonous 

 throughout their whole length and several times 

 branched. As is usually the case the ramifica- 

 tion in the full grown trichoblast seems to be 

 dichotomous but when young stades are examined 

 we see that it is monopodial with alternate 



Jtj- .-:■ ^ ,7r B iX'^ ,~&e 



Fig. 303. Bostrychia 



tenella (Vahl) J. Ag. 



Summit of branch 



with cystocarp. 



(About 25:1). 



Fig. 304. Lopho- 

 cladia trichocla- 

 dos (Mart., C. 

 Ag.) Schmitz. 

 Summit of a fil- 

 ament. (About 

 260:1). 



