. Botanisk tidsskrift. Botany; Plants; Plants. — 142 — one chromatophore may be seen in each cell, and I have only seldom seen cells containing two chromatophores. It was gathered with unilocular sporangia in February. N. I cel. Glæsibær in Eyjafjöröur (O. D.). Ualfsia ovata K. Rosenv. Grl. Havalg. p. 900, Deux. Mém. p. 94. This species has been found in the upper sublitoral region down to a depth of 4 fathoms, growing on stones in company with Lithothamnion læve. It has only been found in two places, in NW. Iceland w7here it had young unilocular sporangia in the beginning of Sept., and in SW.
. Botanisk tidsskrift. Botany; Plants; Plants. — 142 — one chromatophore may be seen in each cell, and I have only seldom seen cells containing two chromatophores. It was gathered with unilocular sporangia in February. N. I cel. Glæsibær in Eyjafjöröur (O. D.). Ualfsia ovata K. Rosenv. Grl. Havalg. p. 900, Deux. Mém. p. 94. This species has been found in the upper sublitoral region down to a depth of 4 fathoms, growing on stones in company with Lithothamnion læve. It has only been found in two places, in NW. Iceland w7here it had young unilocular sporangia in the beginning of Sept., and in SW. Iceland having young unilocular sporangia in June. More than two sporangia on the same filament have not been found in the Greenlandic specimens, but my specimens from NW. Iceland have usually had 2— 5 sporangia on the same filament, which were placed unilaterally on the filament (fig. 1, a), alternating or some- times more irregularly scattered (fig. 1, b, d) ; sometimes each cell in the filament, with exception of the apical cell, bears a sporan- gium. Regarding the shape of the sporangia my plants do not fully agree with the Greenlandic speci- mens, but as the sporangia in my specimens are undeveloped and some of them show an approximately ovate shape, this difference, I think, is af no importance. In other respects the Icelandic specimens are precisely agreeing with Rosenvinge's description and figures (1. c). Each cell has one chro- matophore as pointed out by Rosenvinge (Deux. Mém. 1. c). The crust attains a considerable thickness ; I have seen more than 20 cells in each vertical row of its compact part. The plurilocular sporangia of R. ovata are unknown, but Rosenvinge (Deux. Mém. 1. c.) hypothetically utters, that the plurilocular sporangia described by Areschoug and Kjellman and by them attributed to Litho- derma fatiscens (cfr. Kuck. Remerk. I, p. 238 — 240), might be regarded as belonging to R. ovata. I think that the description and the figures (fig
Size: 1866px × 1339px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
