Mjrxophycese, Isocystideae, Isocystis. 385 



B Filamenta in vaginis evidentibus, membranaceis inclusa {Auloaireoe.). 



Richelia J. Schmidt. — Filamenta singula, endophytice viventia; heterocystse 



terminales. 

 AuJosira Kirchn. — Filamenta in vagina singula; heterocystie intercalares. 

 Microchmte Thur. — Filamenta in vagina singula; heterocystye intercalares et 



terminales. 

 Horiaofhamnion Gom. — Filamenta complura plerumque in vagina consociata, 



stratum membranaceum vel filamentosum fingentia. 



Subfamilia ISOCYSTIDE^. 



Heterocystte riulke ; trichomata iiionilifonnia. 



ISOCYSTIS Borzi [1878] Morfologia e biologia delle Alghe ficocroniacee, 

 in N. Giorn. Bot. It. vol. X, p. 278, Nachtriige zur Morphologie 

 und Biologie der Nostochaceen, in Flora (1878), n. 30, p. 468 (Etyin. 

 isos similis et cystis vesica), Born. et Flah. Rev. des Nostoc. he- 

 teroc. IV, p. 261. — Thallus parvus aut minimus, laete c&ruleus 

 vel dilute aerugineo-olivascens, submembranaceo-lubricus; tricho- 

 niata tenerrima, recta, apices versus sensini attenuata, paralleliter 

 decurrentia, fasciculatim et densissime congregata, articulis elli- 

 ptico- aut splia^rico-compressis, arcte et ssepe oblique connexis, 

 plerumque mutua pressione angulosis; sporse globosae, cellulis ve- 

 getativis duplo majores, aureo-fuscae, exosporio crasso, subtiliter 

 granulato-scabro. 



Obs. Genus a claro Borzl iii duas sectiones dividitur, quarum 

 una species trichomatibus paralleliter concretis sporisque aureo- 

 fuscis asperulis instructas, altera vero species trichomatibus muco 

 citissime obstrnente solitariis aut irregulariter aggregatis et sporis 

 coeruleis vel olivascentibus levibus donatas amplectitur. 



1. Isocystis messanensis I. c t. IX, 1878, Flora, 1878, n. 30, p. 469, 935 

 Hansg. Prodr. II, p. 121. fig. 36 (dext.). — Characteres typici ge- 

 neris; trichomatibus 4-5 [x. crassis; sporis exosporio scabro donatis. 

 Hah. ad muros humidos in fonte aquie dulcis Messan:u Siciliye 

 (BoRzi). 



2. Isocystis infusionum (Kuetz.) Borzi in Flora 1878, n. 30, p. 468, 936 

 Hansg. Prodr. II, p. 121, fig. 36 (sinist.), Anabcena infnsion.im 



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