202 ED. BORMET ET CH. FLAHAÏJLT. 



inferiori adnato ; filis contorto-flexuosis, dense iraplicatis; 

 vaginis haud raro per totum thallum distinctis et lutescenti- 

 bus, interdura plane indistinctis ; trichomatibus e tenuioribus 

 generis, 2,2-3 |jl crassis, plus minus aerugineis, articulis sub- 

 globosis vel diametro subduplo longioribus; heterocystis 3 [x 

 crassis subsphgericis ; sporis subglobosis vel ovalibus, 4 p. 

 crassis, 6 (x longis, episporio Isevi lutescente (v. v.). 



Hab. ad Muscos et terram in Suecia (Zetterstedt!), Anglia 

 (Carmichael !), Belgia!, Gallia!, nec non in tepidariis Ger- 

 maniae (A. Braun !). 



16. IV. calcicola Brébisson 



in Meneghini, Monographia Nostochinearum ilal., p. 121, 1843; — Kiitzing, Tabules 

 phycolog., II, p. i, tab. 10, fig. IV; — Rabenliorst, Flora europ. Algar., H, p. 174; 

 Bornet et Thuret, Noies algologiques, p. 100; — (non Agardh). 



Thallo mucoso, lubrico, diffïuente, expanso, atro-viridi, 

 maculis Cylindrospermonm simillimo; filis flexuosis laxe 

 intricatis; vaginis exterioribus passim distinctis, interioribus 

 confluentibus mollioribus; trichomatibus 2,5 [x crassis, pallide 

 serugineis, articulis subsphgericis, rarius diametro longioribus ; 

 heterocystis subsphgericis, 4 jx crassis ; sporis fere globosis, 

 3-4 jx crassis; 4-5 [x longis, episporio lasvi lutescente (v. s.). 



Hab. ad muros calce illitos in Gallia prope Falaise (Brébis- 

 son!). 



Sectio VI. — Communia. 



17. IV. foliaceum Mougeot 



Stirpes Vogeso-rhenanœ, fasc. XIV, n" 1372!, 1854;— Bornet et Thuret, Notes algolo- 

 giques, p. 101 ; — (non Agardh). 



Thallo gelatinoso tremulo, spongioso, lacunoso, subpellu- 

 cido, virido-olivaceo vel fuscescente; filis flexuosis intricatis, 

 dilute gerugineis ; trichomatibus 4 [x crassis ; articulis sphae- 

 rico-compressis ; heterocystis 7 {x crassis, subsphgericis; sporis 



