146 Myxophycese, Oscillatoriacese. 



Phormidium Kuetz. — Vaginse mucosae diffluentes ; filamenta stratus membra- 



naceos efFormantia, apice ssepe curvata. 

 Proterendothrix West. — Vaginse mucosae diffluentes; filamenta singula initio 



endophytice deinde epiphytice viventia. 

 Filarszkya Nob. — Vaginae solidse, aclirose, apice clausse ; filamenta brevia semper 



pauoicellularia, apice recta. 

 Lyngbya Ag. — Vaginse solidse (nec mucosse), aclirose, raro luteolse; filamenta 



solitaria vel in floccos, caespitulos aut pulvinulos consociata, apice nunquam 



curvata. 

 Symploca Kuetz. — Vaginse solidae (nec mucosae), achroae, raro luteolse ; filamenta 



in csespitulos penicillatos erectos varieve curvatos concrescentia. 

 Porphyrosiphon Kuetz. — Vaginse solidse, plus minus interne purpurese. 



IV. Filamenta fasciculata, vagina crassitudine variS, circumdata, facies elongata 



plerumque ramosa. Species substrato cuidam adfixse. — Subfamilia Schi- 

 zotrichece. 



A Filamenta e paucis triohomatihus constituta {EuschizotrichecE). 



Hydrocoleus Kuetz. — Vaginse mucosse, achrose, diffluentia inter se adhaerentes, 



cellula apicali calyptrata. — Plantse aquaticse. 

 Hypheothrix Kuetz. — Vaginse solidse (nec mucosae), semper tenues, achrose; 



filamenta subtilia in stratum membraceum solidum contexta. 

 Symjylocastrum Gomont. — Vaginae solidse, achroge vel pallide coloratse, cellula 



apicali non calyptrata ; trichomata arcte in vagina aggregata, in caespitulos 



symplocoideos erectos consociata. 

 Inactis (Kuetz.) Thur. — Filamenta pulvinata; ceterum ut in Symplocastro. 

 Schizothrix (Kuetz.) Gomont. — Vaginse solidse, apice clausse, varie coloratee; 



filamenta ramosa, trichomatibus dense aggregatis. 

 Polychlamydum West. — Vaginee solidge apertse, varie coloratae; filamenta non 



ramosa. 

 LasygJcea Thwait. — Triehomata intra vaginam latissimam pauca, laxissime 



disposita, cellula apicali membranam haud incrassatam prsebente. 



B Filamenta e trichomatibus numerosis intra vaginam dense aggregatis con- 

 stituta {Microcolece). 



Sirocoleus Kuetz. — Vaginae solidee nunquam invicem adhserentes. 

 Microcoleus Desmaz. — Vaginse mucosae inter se adhaerentes. 



V. Filamenta solitaria vel inter se varie eonsociata, tegumento crasso gelineo 



circumdata; facies familiarum subsphserica, ellipsoidea vel fusiformis ; 

 species pelagicse libere natantes. — Subfamilia Pelagotrichece. 



Catagnymene Lemmerm. — Trichomata plerumque singula vel in fragmenta 



dilabentia, vagina crassissimS, circumdata. 

 Pelagothrix J. Schm. — Trichomata complura fasciculatim vagina crassa cir- 



cumfusa; familise fusiformes. 

 Haliarachne Lemmerm. — Trichomata curvata, radiantia, vagina crassa cir- 



cumdata: familise subsfsericse. 



