s 



nonnulI;e strata superficialia peculiaria Flos-Aciua) sic dicta effor- 

 mantes '). 



Conspectus Ordinum 



I. Coccogoncce. — Algn3 unicellulares, singuhio vel in familias 

 varie constitutas consociat«. Propagatio fit et scissione vegetativa 

 cellularum et generatione 4 vel plurium gonidiorum immobilium ex 

 divisione contentus cellulse cujusdam genitorum. 



II. Hormogonece. — Algae pluricellulares ^), quarum cellula} in 

 series singulas vel ramosas plerumque uniseriatim, raro in seriebus 

 plurimis dispositae sunt; hciec fllamenta vaginis tenuibus vel crassis, 

 arctis vel inter se distantibus circumdata sunt; filamentum nudum, 

 trichoma; cum vaginis, filamentum appellatur. Propagatio aut revul- 

 sione fragmentorum trichomatis libere viventiuni motu singulari 

 circumnutanti proeditorum flt, qui illico vel certo tempore interjecto 

 evolvuntur (hormogonia) ; aut sporis, quoe divisione repetita contentus 

 hormogonia vel filamenta juvenilia efhciunt. 



Ordo I. Coccogoneae (Thur.) Kirchn. 



Coccogonece Tliur. [1875] Essai class. Nostoc. p. 6 ampl., Kirchn. [1898] in En- 

 gler & Prantl Natiirl. Pflanzenfam. p, 50. 



Thallus unicellularis, cellulis consociatis dein familias pluricellu- 

 lares rarissime filamentosas efiiciens. 



qufedam Nostocis ac Anabcence, de quibus cfr. Cohn, Ueb. paras. Algen (Beitr. z. 

 Biol. d. Pflanzen, 1872); L. Marchand in Bull. Soc. bot. de France T. XXVI, 

 p. 336, 1879; Janczewski in Ann. Sc. Nat., Bot., 5 sfer., T. XVI, p. 306, 1872; 

 Leitgeb, Ueb. Nostoc-colonien im Thallus der Anthoceroteen, Wien 1878; Waldner, 

 Eutst. d. Schliiuche in den Nostoc-Colonien bei Blasia, Wien 1878; Reinsch in 

 Botan. Zeitung 1879, p. 17, 33; Reinke in Botan. Zeitung 1879, p. 473; Treub 

 in Nederl. Kruidk. Archief 2 s6r,, 1882, p. 407; Hariot in Compt, rend. Acad. 

 Sc. Paris T. CXV, 1892, p. 325 ; Schneider, Mutual. Symbiose (in Botan. Gazette 

 1894); B. Jonsson, Stud. ofv. Algparas, hos Gunnera (in Bot. Notiser 1894); Life, 

 The Tuber like of Cycas revoluta (in Botan. Gazette vol. XXXI, n. 4, April 

 1901, p. 264 et seq.); Pampaloni in N. Giorn. bot. ital. 1901, p. 626; Trotter, Studi 

 cecidologici II (in Nuova Notarisia 1901, p. 7). 



') Citationes bibliographicae reperiuntur in De Toni: Sopra un Flos-aquee 

 compai'So a Galliera Veueta (Atti R. Ist. Ven. 1895); dein comparandse sunt 

 praesertim observationes a claris P. Richter, Klebahn, Molisch etc, in hicem editee. 



'j Raro uuicellulares. 



