Myxophycese, Rivulariaceae, Dicbothrix. 643 



Hansg. Prodr. JI, p. 52, Wolle Freshw. Alg. of U. S. p. 237, 

 tab. CLXVIII, fiy. 6-7. — Gespitibus sparsis vel in stratiini sub- 

 continuum approximatis, stepissime inter fila Hypheotrichum et 

 Leptotrichum nidulantibus et tufis calcareis incrustatis; filis circ. 

 2 mm. altis, 15-18 (x. crassis (in pseudoramis ultimis) erectis, pe- 

 nicilhitis; pseudoramis superioribus adpressis, vagina communi 

 deorsum involutis, vagina crassa, lamellosa, Ifevi, aureo-fuscescente, 

 domum opaca, ocreata, ocreis apice dihitatis, truncatis, laceris; 

 trichomatibus viridi-olivaceis, G-8 [x. crassis, in pilum longe atte- 

 nuatis, articulis diam. lequalibus vel p lulo longioribus. 



Hab. in muris, rupibus calcareis udis, etiam mari irroratis 

 GotlandisB ( Wittrock, Cleve), Fennite (Elfving), Gallite(l3REBissoN), 

 Vogesorum (Mougeot), Helvetiae (Wartmann, Theobald, Braunj, 

 Bohemiie(HANSGiRG), GermanicB (Kuetzing, Rabenhorst, Kirchner), 

 Daniae (Schmidt, Jensen), Austria^ (Grunow, Von Morl, Hansgirg, 

 ScHiEDERMAYRj, It diic iu Pedemontio (Cesati), Tyroline (Kirchner, 

 Hansgirgj, CarinthiEe, Dalmatiae (Hansgirgi, India^, prope Igatpuri 

 (Kunze), «New Jersey» Amer. bor. (Wolle), Connecticut (Setchell), 

 Minnesotae (Tilden), Californiae Amer. bor. (Setchell); in Scyto- 

 ncmatibus ad «Pungo Andongo» Afr. tropicte (Welwitsch); in Al- 

 geria (Debray), in ins. Mauritio (Jadin). — Var. major Grun. ia 

 Poetsch & Schiederm. Syst. Aufzahl. der im Erzherzogt. Oesterr. 

 ges. samenl. Pfl. p. 28. — In rupe huda prope cataractam fluvii 

 «Vockla» prope « Vocklabriick » (Von Morl). 



Dichothrix compacta (Ag. ?) Born. et Flah. Rev. I, p. 379, Scyto- 1474 

 nema compactum Ag. Disp. Alg. Suec. pag. 39, 1812 (?), Lyngb. 

 Hydrophyt. dan. p. 97, tab. 281, non Kiitzing, Scytonema pulveru- 

 lentum Ag. Syst, Algar. p. 40, 1824, Schizosiphon crustiformis 

 Saut. in Rab. x\lg. n. 1124! — Filis in stratum ctespitosum densis- 

 sime aggregatis, usque ad inm. altis, 9-12 \^.. crassis, erectis, peni- 

 cillatis, pseudoramis superioribus adpressis, saspe in vagina com- 

 muni deorsum inclusis; vagina lamellosa, hevi, aureo-fuscescente, 

 uniformi vel ocreata, ocreis apice dilatatis, laceris; trichomatibus 

 dilute olivaceis, 6 [i. crassis, in pilum apice productis; articulis 

 diam. tequantibus vel eo usque 2-pIo brevioribus; heterocystis ba- 

 silaribus. 



Hah. ad saxa rivulorum et tignamenta inuadata Norvegia^ 

 (Lyngbye) et ad saxa circa Holmiam Sueciae (Agardh, Nordstedt), 

 Gloeocapsis variis intermixta; in Fennia (Elfving), Carinthia in 

 lacu «Felder» (Hansgirg), in insulis Faeroensibus (Boergesen), in 



