. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . thallus of Turnerella Pennyi (a red seaweed of the Rhodophyllidaceae). One fresh-water species of Cksetobolus—Oh. lapidicola Lagerh.—is found on stones in streams in thenorth of Norway. Protoderma viride Kiitz. is a common freshwater Alga occurring as anepiphyte on species of Lemna, , etc. Pseudulvella americana (Snow) Wille is afreshwater epiphyte of N. America. Ulvella involvens (Savi) Schmidle ( = Dermatophyton 300 Ulotrichale
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . thallus of Turnerella Pennyi (a red seaweed of the Rhodophyllidaceae). One fresh-water species of Cksetobolus—Oh. lapidicola Lagerh.—is found on stones in streams in thenorth of Norway. Protoderma viride Kiitz. is a common freshwater Alga occurring as anepiphyte on species of Lemna, , etc. Pseudulvella americana (Snow) Wille is afreshwater epiphyte of N. America. Ulvella involvens (Savi) Schmidle ( = Dermatophyton 300 Ulotrichales radians Peter) is epizootic on the carapace of the European water-tortoise (Cleminyscaspica). Ulvella fucicola Rosenv. is partially parasitic 011 plants of Fucus, causing adestruction of the peripheral cells. It is probable that all the Ulvellese have originated from the Chsetophorese by areduction and modification of the branch-system consequent upon the adoption of acompletely epiphytic mode of life. Arthrochsete should be compared with Pseudochsete since both these genera are reallyintermediate between the Chsetophoreye and the Fig. 193. A—C, OchloclitEte ferox Huber. A, young plant, x 383 ; B, section through a part ofplant with zoogonidangia, x 383; C, zoogonidia, x 1050. D and E, Chsetobolus gilbusEosenv. D, section through plant, x 316; E, small part of same, x 526. (A—C, afterHuber; D and E, after Rosenvinge ; from Wille.) Sub-family This group as here defined is equivalentto the Microthamniacese (West, 04) and almost the same as the Leptosireae(Wille, 09). The Microthamniacese was originally separated from theChsetophoracese on two characters: first, the absence of murticellular hairs,arid secondly, the restricted origin of the zoogonidia. Recent investigationshave shown, however, that neither of these characters is sufficientlypronounced or constant to be utilized as a basis upon which a family Microthamniaceae can be rightl
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