202 



Fig. 303. Bostrychia 



tenella (Vahl) J. Ag. 



Summit of branch 



with cystocarp. 



(About 25:1). 



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 of 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. Lophothalieae. 

 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. 553. 



Conferva trichoclados Mert. mscr. 



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

 p. 132. 



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

 II. ser., 1842, p. 254; HARVEY. Nereis Bor.-Am., II, 

 p. 65. 



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

 834; Tabula? Phycol. XIV, tab. 22, fig. a b. 



Dasya trichoclados J. Ag., In Historian! Alga- 



rum Symbolse, LinnaBa, vol. 15, 1841, p. 32; Spec. Alg., vol. II, p. 3, p. 1229. 

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

 XI, Florideae, p. 64. 



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

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

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

 segments being divided rather late into a central 

 and four pericentral cells. Also in the trichoblasts 

 transverse walls are developed rather late. 



The trichoblasts are placed in a screw turning 

 to the left with a divergency of */4, one from 

 each segment (Fig. 305). They are monosiphonous 

 throughout their whole length and several times 

 branched. As is usually the case the ramifica- 



Fig. 304. Lopho- 

 cladia trichocla- 

 dos (Mert.. C. 



tion in the lull grown tnchoblast seems to be Ag.) Schmitz. 

 dichotomous but when young stades are examined 

 we see that it is monopodial with alternate 



Summit of a fil- 

 ament. (About 

 260:1). 



