92 MORPHOLOGY AND TAXONOMY, ALGAE [BoT. Absts., Vol. X, 



589. CoupiN, Henri. Algae. Album G^n. des Cryptogames Fasc. 27. PL 2^5-252. 

 1921. — In the present fascicle the presentation of genera of the Rhodomelaceae is continued. 

 [See also Bot. Absts. 10, Entry 585.] — J. R. Schraynm. 



590. CoupiN, Henri. Algae. Album G4n. des Cryptogames Fasc. 28. PI. 253-260. 

 1921. — In the present fascicle the author presents the remaining genera of Rhodomelaceae and 

 begins the treatment of the Ceramiaceae. [See also Bot. Absts. 10, Entry 585.] — J. R. 

 Schramm. 



591. HoDGBTTS, W. J. Notes on freshwater algae. I-IV. New Phytol. 19: 254-263. 

 Fig. 1-2. 1920. — A new species of Pyramimonas, P. inconstans, is described from near Bir- 

 mingham. — Zoogonidia of Oedogonium cryptoporum Wittr., with cilia of a length unusual in 

 the Oedogoniaceae, are described and figured, with notes on the mode of progression. — The 

 Hormidium state of Prasiola crispa shows under certain conditions a false branching compara- 

 ble with that of Tolypothrix. — The gametes and zygotes of Chlamydomonas variabilis Dang, 

 are described and figured, — /. F. Lewis. 



592. J., J. Recent English marine biology. [Rev. of: Allen, E. J. Contribution to the 

 quantitative study of plankton. Jour. Marine Biol. Assoc. 12: 1-8. 1919 (see Bot. Absts. 4, 

 Entry 1008).] Nature 104: 707. 1920. — Four 10 cc. samples gave a mean of 14.45 organisms 

 per cc. The same sample examined by inoculating flasks (sterilized sea water with culture 

 solutions used by Allen and Nelson for marine diatoms) showed 464 organisms per cc. This 

 result is apparently an under-estimate as some organisms found in centrifuged samples did 

 not grow in the medium. "The result is therefore another and closer approximation to a 

 biological value which is of extraordinary interest." — 0. A. Stevens. 



593. Janet, Chas. Sur le Botrydium granulatum. [Concerning Botrydium granulatum.] 

 4 p., 1 pi. Limoges, 1918. — The plants are found in more or less irregular and often branched 

 form or as pyriform vesicles developed from (1) a purely vegetative cell, (2) an asexual piano- 

 spore, (3) a zygote. In each case the cell develops a simple vesicle consisting of a spherical 

 layer of nucleated chlorophyllous protoplasm covered with a wall and surrounding a cavity 

 filled with a clear fluid containing numerous corpuscles. A narrow aerial tube is developed 

 from the upper part, a rhizoidal tube from the lower, the former developing into the vesicle. 

 There are 3 kinds of vesicles distinguished by the nature of the cell producing them: (1) 

 Those in which all of the cells of the parietal layer of the vesicle develop in situ into small 

 syncytial blasteas which, through the collapse of the vesicle, are dislodged and disseminated 

 by rain and generally germinate at once. (2) Those in which the protoplasmic layer becomes 

 divided into 1 or several layers of naked protoplasts which become planospores by acquiring 

 a single flagellum. These are then discharged when moist by the swelling and rupturing of 

 the vesicle, later lose their flagella, develop into small spherical blasteas, and germinate as 

 above. (3) Those in which, toward the end of summer, 1 cell in the parietal layer develops 

 in situ into a syncytial blastea at the expense of the rest of the layer, which degenerates and 

 disappears, leaving the blastea to fill the mother vesicle. Each nucleus of the blastea be- 

 comes a gamete. The pyriform blastea, when the gametes are about ripe, is discharged by 

 the breaking up of the containing vesicle. When conditions are favorable the wall of the 

 blastea is gelatinized and the gametes are discharged and unite to form zygotes. The blastea 

 is homologized with the oogonium and spermagonium of Fucus and with the structure pro- 

 ducing the gametangia in the vascular cryptogams. — Winifred Goldring. 



594. McN AUGHT, James Bernard. Algae of Kansas reservoirs. Trans. Kansas Acad. 

 Sci. 29: 142-177. PL 1-4. 1920.— The author presents the first report of the survey of the 

 algae of Kansas, with the special object of aiding the sanitary engineer, including 19-page 

 list of species in key-form; 110 species are listed, only 12 of which had been previously reported 

 from Kansas. Under reservoir conditions changes due to differences in the seasons do not 

 appear to occur. — Examples of the successful use of the copper sulphate method of treatment 

 are given. The algae found most active in causing bad tastes, colors, and odors are species 



