. Dansk botanisk arkiv. Plants; Plants -- Denmark. 310 Dansk Botanisk Arkiv, Bd. 3, Nr. 1. Danish islands; comp. J. Agardh, Spec. Alg., vol. II, p. III, p. 1230. Later on Ørsted collected it at St. Thomas and St. Croix. St. Croix: Near Green Cay Estate and at the entrance to the lagoon of Christiansted (both places washed ashore). St. Jan: Dredged in many places in the sound between this island and St. Thomas. Geogr. D i strib.: West Indies. Wrightiella Schmitz. 1. Wrightiella Tiimanowiozii (Gatty) Schmitz. Schmitz, Fr., Die Gattung Lophothaha J. Ag. (Ber. der deutsch, bot. Ges., Bd. XI, 1893,
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 310 Dansk Botanisk Arkiv, Bd. 3, Nr. 1. Danish islands; comp. J. Agardh, Spec. Alg., vol. II, p. III, p. 1230. Later on Ørsted collected it at St. Thomas and St. Croix. St. Croix: Near Green Cay Estate and at the entrance to the lagoon of Christiansted (both places washed ashore). St. Jan: Dredged in many places in the sound between this island and St. Thomas. Geogr. D i strib.: West Indies. Wrightiella Schmitz. 1. Wrightiella Tiimanowiozii (Gatty) Schmitz. Schmitz, Fr., Die Gattung Lophothaha J. Ag. (Ber. der deutsch, bot. Ges., Bd. XI, 1893, p. 222. Falkenberg, P., Rhodomelaceen, p. 559. Dasya Tumanowiczii Gatty in Harvey, Nereis , part II, p. 64. KüTziiVG, Tabul. Phycol., vol. XIV, tab. 63. The plant has four pericentral cells which on a later stage are more or less covered by a cortical layer (Fig. 314). What especially distinguishes this plant are the polysiphonous, short, spinelike endogenous branchlets found scattered upon the thallus. Moreover it is endowed with exogenous, mostly short hving, mono- siphonous side-organs. These Falkenberg refers to as "monosiphone Kurztriebe (nicht Blätter)", I call them trichoblasts. The plant increases by means of an apical cell from which flat segments are cut off (Fig. 313); from these the trichoblasts begin to grow out long before WnfhuTaTu- ^^^ Segments are divided. manowiczii The trichoblasts are placed in a screw line, with SdimS. ^ divergency of 14 of the periphery, upon the main Summit of the hlament (Fig. 314) and consist of a monosiphonous (About'500:1) "^^^^ ^*^"^' ^^^"^ which the monosiphonous branches issue spirally with a divergency of V«—Vj- In the sterile plant the cells in the trichoblasts are small at the base, increasing evenly until somewhat above the middle of the whole trichoblast, then tapering slowly to the blunt or generally acute ends of the filaments (Fig. 315). The cells of the trichoblast are cylindrical or
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