. 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 Rhodophyllidacese). One fresh-water species of Chsetobolus—Ch. 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, Callitriche, etc. Pseudulvella americana (Snow) Wille is afreshwater epiphyte of N. America. Ulvella involeens (Savi) Schmidle ( = Dermatophyton 300 Uloirichales
. 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 Rhodophyllidacese). One fresh-water species of Chsetobolus—Ch. 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, Callitriche, etc. Pseudulvella americana (Snow) Wille is afreshwater epiphyte of N. America. Ulvella involeens (Savi) Schmidle ( = Dermatophyton 300 Uloirichales radians Peter) is epizootic on the carapace of the European water-tortoise (Clemmyscaspica). Ulvella fucicola Rosenv. is partially parasitic on plants of Fucus, causing adestruction of the peripheral cells. It is probable that all the Ulvellese have originated from the Chsetophoreae by areduction and modification of the branch-system consequent upon the adoption of acompletely epiphytic mode of life. Arthrochaete should be compared with Pseudoch&te since both these genera are reallyintermediate between the Chsetophorete and the Fig. 193. A—C, Ochlochsete ferox Huber. A, young plant, x 383 ; B, section through a part ofplant with zoogonidangia, x 383; C, zoogonidia, x 1050. D and E, Cheetobolus gibbusRosenv. 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 Microthamniaceae (West, 04) and almost the same as the Leptosirese(Wille, 09). The Microthamniacese was originally separated from theChsetophoracese on two characters: first, the absence of multicellular hairs,and 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 Microthamniacese can be rightly esta
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