. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 45 Cellulæ cylindricæ in inferiori parte filorum ca. 11// latæ 40// longæ, in superiori 7—8// latæ 40 /j. longæ, chromatophorum parietale, pyrenoide laterali, instructum continentes. Sporangia sessilia, raro pedicellata in parte basali ramorum uniseriata, monospora aut raro hispora, ovalia, ca. 18—20/i longa et 9—12« lata. The basal part of this species is immersed in the mucilage and chalk incrustation of the host plant [Liagora elongata). On germination the spore does not divide and remains t
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 45 Cellulæ cylindricæ in inferiori parte filorum ca. 11// latæ 40// longæ, in superiori 7—8// latæ 40 /j. longæ, chromatophorum parietale, pyrenoide laterali, instructum continentes. Sporangia sessilia, raro pedicellata in parte basali ramorum uniseriata, monospora aut raro hispora, ovalia, ca. 18—20/i longa et 9—12« lata. The basal part of this species is immersed in the mucilage and chalk incrustation of the host plant [Liagora elongata). On germination the spore does not divide and remains throughout undivided ; its diameter is about 16//. After the germination it produces endophytic fdaments from its lower side; these creep downwards fixing themselves to the assi- milating filaments of the host plant (Fig. 42 c). From the upper end an erect (or sometimes two) is given off (Fig. 42 a) ; this is at first undivided but after having grown so that it is quite free of the Liagora tissue it becomes branched. The ramification is some- what slight. The branches are given off at an acute angle and the branches themselves are ramified in the same way giving the plant a cluster-like appearance. Towards the summit the branches taper into hair-like filaments the cells of which are long and nearly colourless and soon die away at the end (Fig. 42 a). The cells in the filaments are about 10—11/i thick and about 27—40// long; near the base the filaments are a little thinner, about 8 //; in the hairlike ends the cells taper to about 7—8,«. The chromatophore (Fig. 43) is parietal, often with elongations towards the wall of the cell and it encloses a lateral pyrenoid. The sporangia (Figs. 42 «, b, Fig. 43) are sessile, oval-ovate. They are about 9—12 ß broad and 18—20 a long. Monosporangia mostly occur, but in a few specimens some were divided by a transverse wall into two spores (Fig. 43). It is perhaps not impossible that Acrochæiium Barbadens
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
