. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 29 Discus basalis bene evolutus, unistratosus, e filis repentibus ramosis, cellulis fere isodiametricis, compositus. Fila erecta nume- rosa, parce ramosa, ad apicem versus attenuata et in pseudopila producta; in basi et media parte 5—6//, in superiori parte 2—3// crassa, cellulis inferioribus c. 14^«, mediis c. 30/<, superioribus 10 fj. vel plus longis. Chromatophorum parietale, pyrenoide laterali instructum. Ramuli sporangiferi numerosi, sparsi aut sæpe oppositi, 1—3, rarius plures, cellula
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 29 Discus basalis bene evolutus, unistratosus, e filis repentibus ramosis, cellulis fere isodiametricis, compositus. Fila erecta nume- rosa, parce ramosa, ad apicem versus attenuata et in pseudopila producta; in basi et media parte 5—6//, in superiori parte 2—3// crassa, cellulis inferioribus c. 14^«, mediis c. 30/<, superioribus 10 fj. vel plus longis. Chromatophorum parietale, pyrenoide laterali instructum. Ramuli sporangiferi numerosi, sparsi aut sæpe oppositi, 1—3, rarius plures, cellulas continentes. Sporangia ovata, 7—8// lata et 8—10// longa. This species was found upon Chætomorpha antennina upon which it forms small dense nearly globular or semiglobular tufts. The basal part (Fig. 21) of the plant consists of creeping ramified fdaments, more or less fusing together and forming in this way a large disc. The cells in the disc are rather irregularly shaped, about as long as broad or a little longer i. e. from 5 to 11/< broad. From this basal part numerous erect fda- ments grow up ; those in the middle are nearly straight, those in the periphery are bent out- wards in view of space and light. At the base the erect filaments are about 5—6// broad and the length of the cells about 14/«. Upwards the length of the cells increases gradually reaching in the middle of the filaments about 30/«. From here the cells not only grow longer but the filaments also taper towards their summits in such a way that the uppermost cells only reach a breadth of 2—3/« while the length of the cells on the other hand is often more than 70/« (Fig. 21). These thin unbranched prolongations of the filaments are nearly or quite colourless and hairlike. While the lowermost cells in the filaments taper a little at both ends those higher up in the filaments are cyhndrical. The cells con- tain a slightly developed parietal chromatophore lying near the upper end of the
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
