. Botanisk tidsskrift. Botany; Plants; Plants. - 147 — The specimens growing on the old stems of Laminaria hyperborea resemble the R. Rothii in everything, except that the basal filaments are creeping in the subepidermal tissue . of the Laminaria stems. At first I thought that the plant was an endophyte, but by further examination of the Laminaria tissue, I am convinced, that it is only a pseudo-endophyte. The sur- face of the Laminaria stems was rough, the epidermal layer had fallen away, the intercellular substance of the subepidermal tissue was disorganized, and the cell-rows in many cases
. Botanisk tidsskrift. Botany; Plants; Plants. - 147 — The specimens growing on the old stems of Laminaria hyperborea resemble the R. Rothii in everything, except that the basal filaments are creeping in the subepidermal tissue . of the Laminaria stems. At first I thought that the plant was an endophyte, but by further examination of the Laminaria tissue, I am convinced, that it is only a pseudo-endophyte. The sur- face of the Laminaria stems was rough, the epidermal layer had fallen away, the intercellular substance of the subepidermal tissue was disorganized, and the cell-rows in many cases split. The basal filaments of the Rhodochorton were creeping in the dead tissue, but the death of the tissue did not seem to have been caused by it. Sometimes it is difficult to see whether the Rhodochorton has caused the destruc- tion of the tissue, or not, but several times it is easily seen, that the tissues were dead when the Rhodochorton ap- peared. The Polysiphonia urceolata, which grew among the Rhodochorton on the Laminaria stems in the dead tissue, was a „pseudo-endophyte", in the same manner as the R. Rothii. The R. pafetsiticum Batters l) is cer- tainly identical with the R. Rothii growing in the dead tissue of the Laminaria Fig. 3. Rhodochorton Rothii. Transverse section of part of the stem of Laminaria hyperborea showing the Rhodochorton fila- ments creeping in the dead and dying tissues (138: 1). E. lcel. Vattarnes. c el. Grjötnes (CO.). NW. Icel. Dyrafjöröur (CO.). SW. lcel. Probably common. Ölafsvik, Brimnes, Reykjavik, Hafnar- fjöröur. S. Icel. Vestmannaeyjar. Rhodochorton repens H. Jonsson nov. sp. Planta epipbytica c. 1 mm. alta, fîlis erectis 8—13 /j. crassis e basi a filis repentibus constitute) egredientibus, inferiore parte nudis, superiore autem circiter a medio ramosis. Rami sparsi, alterni, sæpe secundi (præsertim rami superiores), interdum oppositi, et in supremo axi primario corymbosi, sporangia gerentes. Rami (rarnuli
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Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
