. Dansk botanisk arkiv. Plants; Plants -- Denmark. 302 Dansk Botanisk Arkiv, Bd. 3. Nr. 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
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 302 Dansk Botanisk Arkiv, Bd. 3. Nr. 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 , II, p. 65. Polysiphonia lophoclados Spec. Alg., p. 834; Tabulae Phycol. XIV, tab 22, fig. aâb. 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- .-:â ^ ,7r B iX'^ ,~&e Fig. 303. Bostrychia tenella (Vahl) J. Ag. Summit of branch with cystocarp. (About
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