ar 
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Ordo I: Gloeosipheae Ktz. (= Hormogoneae Thur.). 
Subordo 1. Heterocysteae (Stiz.) Hang. 
Fam. 1. Seytonemaceae (Stiz.) Bzi. 
Subfam. 1. Sirosiphoneae Stiz. 
Tribus 1. Stigonemeae (Bzi.) Bor. et Flah. 
Subtribus 1. 
Subtribus 2. 
Subtribus 3. 
Eustigonemeae Hansg. Fila libera, 
cellulis ordine dupliei vel multipliei 
raro uniseriatis; vaginis crassis lamello- 
sis: 1. Stigonema Ag. (mit Subg. 
Fischera (Schwabe), Sirosiphon 
(Ktz.), Phragmonema (Zopf). 
Hapalosiphoneae Hansg. Fila 
libera, cellularum serie simplici, ra- 
rius dupliei; vaginis aretis, tenuibus, 
raro suberassis: 2. Hapalosiphon 
Näg. (Subg.:  Euhapalosiphon; 
Mastigocladus |Cohn]). 3. Mastigo- 
coleus Lagerh. 
Capsosireae Hansg. Fila e cellu- 
larum serie simpliei constituta, in 
frondem pulvinatam, adfixam, paralle- 
liter conereta: 4. Capsosira Ktz. 
Tribus 2. Nostochopsideae Born.etFlah.: 5.Nosto- 
chopsis Wood. 
Subfam. 2. Sceytonemeae (Stiz.) Bzi. 
Tribus 3. Euscytonemaceae Bazi. 
Subtribus 4, 
Subtribus 5. 
Subtribus 6. 
Drilosiphoneae Hansg. Pseudo- 
ramuli gemini vel solitarü, ‘inter 
heterocystas, rarius sub heterocystis 
egredientes: 6. Seytonema Ag. (Subg.: 
Myochrotes Ne et Flah.|; Kusey- 
tonema |Bzi.|). 
Tolypothrichoideae Hansg. Pseu- 
doramuli solitarii, raro gemini, sub 
heterocystis, rarius inter heterocystas 
formati: 7. Tolypothrix Ktz. 
Plectonemeae Hansg. Fila scyto- 
nemaceae pseudoramosa; heterocystis 
et sporis adhuc non observatis: 
8. Plectonema Thur. (Subg.: Euplec- 
tonema; (rlaucothrix |Kirchn.|). 
Tribus 4. Coleodesmieae Bazi. 
Subtribus 7. 
Desmonemeae Hansg. Fila saepe 
pluria (9—8) in vagina communi in- 
celusa, erecta vel subflexuosa, repetite 
subdichotoma pseudoramosa; hetero- 
u 
ie 
