. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . sa (Lemm.) Chod.; D, x 520 (after Lemmermann) ; E, x 450. F and G, L. brevisetn(W. & G. S. West), x450. Hand I, L. ciliata (Lagerh.) amphitricha(La,gerh.) Chod.,x450. The type genus, Micractinium Fresenius (56—58) had been for years entirely over-looked until Wille (09 B) brought it to light again, although the original description andfigures were quite good. The present author agrees with Willes grouping of the recentlydescribed fo
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . sa (Lemm.) Chod.; D, x 520 (after Lemmermann) ; E, x 450. F and G, L. brevisetn(W. & G. S. West), x450. Hand I, L. ciliata (Lagerh.) amphitricha(La,gerh.) Chod.,x450. The type genus, Micractinium Fresenius (56—58) had been for years entirely over-looked until Wille (09 B) brought it to light again, although the original description andfigures were quite good. The present author agrees with Willes grouping of the recentlydescribed forms. The genera are: Micractinium Fresenius, 1856—58 [inclus. Archerina Lankester, 1885 ;Phythelios Frenzel, 1891 ; Golenkinia Chodat, 1894 ; Richteriella Lemmermann, 1896] ;Acanthosphsera Lemmermann, 1898 ; Meringosphxra Lohmann, 1908 ; ? EchinosphseridiumLemmermann, 1904; Lagerheimia (l)e Toni) Chodat, 1895 [inclus. Tetraceras Chodat, 200 Tetrasporinese 18941; Pilidiocystis Bohlin, 1897; Chodatella Lemmermann, 1898; Bohlinia Lemmer-mann, 1899]; Franceia Lemmermann, 1898. Sub-family TETRAEDRE^-E. This small group is chiefly represented by. Fig. 126. A, Tetraedron minimum (A. Br.) Hansg. B, T. caudutiim (Corda) Hansg. C,T. regulare Kiitz. I), T. e nor me (Balfs) Hansg. E—G, T. horridum W. & G. S. , autospores. All x 450. the genus Tetraedron
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