662 Protococcoideae, Palmellaceae, Nephroc^-tiuni. 



ACTIDESMIUM Reinsch [1875] Coiitrib. ad Algol. et Fungol. p. 78 

 (Ijltym. actis radius et destnwn fasciculus). — Thalius ex cellularum 

 familiis in pedicellis elongatis hyalinis radiatim cohaerentibus dis- 

 positis formatus; cellularum familiee subsphcoricae ex cellulis 8-12 

 spha^ricis in pedicellis hjalinis radialiter dispositis composita^. 

 Propagatio zoogonidiis. 



1. ActJdesmium Hookerii Reinsch 1. c. t. VIII, f. 2. — Characteres i-^^^ 

 generis: celj. 8,4-11,8 fj.. diam., famii. 13 p.. diam. («?»). 



Ilab. in fossis aliis Algis unicellularibus immixtum in Franco- 

 nia (Reinsch). 



Subfamilia sexta Nephrocytieae. 



Nephrocxjtieoi [1888] De-Toni Consp. gen. Chloroph. in Notarisia III, n. 10, 



p. 451. 

 Prolococcoideoi inclusce Kirchn. [1878] Alg. Scles. p. 111 p. p., Hansg. [1888] 



Prodr. p. 130. 



Cellulse singulse membrana cellulae primordialis plus minus con- 

 sistente hand diftluente in familias minutissimas conjunctae; familise 

 libere vagantes e cellulis plurium generationum (raro duarum vel 

 trium) succedanearum constitutse. 



Obs. Genera Oocystis Naeg. et Nephrocijtium Naeg. huc relata 

 affinitatera praebent cum Apiocysti A. Br. et Palmodactylo Naeg. 



• Conspectus generum 



Nephrocytium. Cellulae reniformes. 



Oocystis. Cellulse ovales. [Genus vix a prcecedente, nisi cellularura inclusa- 

 rura Ibrma, diversum]. 



NEPHROCYTIUM Naeg. [1849] Gatt. einzell. Alg. p. 80 (Etym. nc- 

 phros renis et cytos cavitas), Rabenii. Fl. Eur. Algar. 111, p. 

 52, Kirchn. Alg. Scles. p. 112, Hansg. Prodr. p. 131, Cooke 

 Brit. Freshw. Alg. p. 25, Wolle Freshw. Alg. U. S. p. 19G, Dan- 

 geard Rech. sur les Algues inferieures in Ann. Scienc. Nat. 1888, 

 p. 159. — Cellulae oblongo-reniformes, 2-4-8-16 in tegumento 

 communi amplo ovali vel late reniformi, gelatinoso, libere natante, 

 vesiculoso inclusse. 



Propagatio bipartitione vegetativa cellularum secus unam tan- 

 tum spatii directionem peracta (sec. Naegeli) rarius zoogonidiis el- 

 lipsoidois, biciliatis (sec. Archer). 



