sumatrana (Mart.) Wittr. — Hedwigia LXIII, Heft i, 1921, 



pag. 43-47- 



298. Zimmermann W, — Zur Entwicklungsgeschichte und Zytolo- 

 gie von Volvox. — Jahrb. fùr miss. Bot. LX, 1921, pag. 256- 

 294, I Taf., 2 Textfig. 



Desmidiaceae, Zygnemaceae. 



299. Cunningham B. — The Occurrence of unlike ends of the 

 cells of single filament of Spirogyra. — Joiirn. of the Elisha 

 Mit cheli Scient. Soc. XXXVI, Febr. 1921, pag. 127-128, piate io. 



300. Groenblad R. — Finniàndische Desmidiaceen aus Keuru. — 

 Ada Soc. prò Fauna et Flora Fennica voi. 47, n. 4, 1920, 

 pp. 98, 6 Tab. 



301. Groenblad R. — New Desmids from Finland and Northern 

 Russia, with criticai Remarks on some known Species. — 

 Ada Soc. prò Fauna et Flora Fennica voi. 49, n. 7, 1921, 

 pp. 78, 7 plates. 



302. Hill G. A. — - Spirogyra gigantea n. sp. — Puget Sound Mar. 

 Stat. Pubi. I, pag. 198. 



303. Hill G. A. — Spirogyra dubia longiarticulata Kiitz. in Wa- 

 shington. — Puget Sound Mar. Stat. Pubi, l, pag. 234, tab. XLII. 



304. Hodgetts W. J. — The Conjugation of Zygogonium ericeto- 

 rum Kutz. — Nezv Phytologist XVII, pag. 238-251, 2 Fig. 



305. Hodgetts W. J. — A new Species of Spirogyra. — Annals 

 of Botany XXXIV, pag. 519-524, piate XXII. 



306. West G. S. & Starkey Clara B. — A Contribution to the Cy- 

 tology and Life-history of Zygnema ericetorum (Kutz.) Hansg., 

 with some remarks on the genus Zygogonium. — New Phy- 

 tologist XIV, pag. 194-205, 5 Fig. 



Characeae. 



307. Lauterbach Luise. — Untersuchungen iiber die Beeinflussung 

 der Protoplasmastròmung der Characeen durch mechanische 

 und osmotische Eingrifife. — Beih. zum Botali. Centralblatt 

 XXXVIII, I. Abt., 1921, pag. 1-52, 2 Textabbild. 



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