M^rxophycese, Scliizotricheae, Ilydrocoleus. 323 



16. Hydrocoleus homceotrichus Kuetz. Phyc. gen. p. 196, Phyc. germ. 785 

 p. 164, Tab. Phyc. I, p. 35, t. 50, f. 1, Sp. Alg. p. 258, Rab. Fl. 

 Eur. Alg. II, p. 150, Gomont Monogr. p. 344, t. XIII, f. 7-10, 

 Vaginaria saxicola Kuetz. Actien (fide Gom.), Alg. aq. dulc. Dec. 

 n. 132!, Scytonema phor?niclioides Bulnh. et Rab. in Rab. exs. 

 n. 352! Hydrocoleum phormidioides Rab. Fl. Eur. Alg. II, p. 151, 

 Inactis homceothrica Kirchn. Algenti. von Schles. pag, 245. — 

 Ciespitibus fluctuantibus, chalybeo-vel fusco-nigrescentibus, inde- 

 finitis, expansis ; filis simplicibus aut parce pseudoramosis, flexuo- 

 sis, plus minusve flexilibus, fasciculato-implicatis; vaginis lamel- 

 losis subdiffluentibus, cylindraceis, superficie erosis, transverse 

 corrugatis, apice apertis aut acuminatis; trichomatibus «rugineis 

 vel chalybeis, intra vaginam pluribus, parallelis vel implicato-con- 

 tortis, interdum solitariis, ad genicula haud constrictis, 6-8 [j.. 

 crassis; articulis diam. trichomatis subaequilongis vel usque duplo 

 brevioribus, 4-6 ]x. longis; dissepimentis frequenter granulatis; 

 apice attenuato, cellula apicali depresso-conica. 



Hab. rivulos et cataractas Galliae centralis ad Issoudun et 

 Sabaudite ad Chamounix (Gomont), Austriae in Styria (Bllnheim), 

 et passim (Geunow, Beck, Stockmayer), Istriae ad Tergeste 

 (KuETziNG, Hansgieg), Carinthise, atque Dalmatine (Hansgirg), 

 Bosniae (PROTic),in cataractis super muscos prope Roboretum Ty- 

 rolise australis (Hansgirg), in lacu Constantia? (Kirchner), in 

 stagnis et in aquis rapide currentibus Amer. bor. (Wolle), in 

 conchis Anodontae ditionis «Connecticut» Amer. bor. (Setchell); 

 ad Caput Bona3 Spei Afric^e (Reinsch). 



17. Hydrocoleus muscicola Hansg. in Sitzungsber. d. Kunigl. buhm. 786 

 Ges. der Wiss. 1891, p. 343. — Strato verrucoso vel floccoso, 

 olivaceo, muscos submersos arcte involventi; trichomatibus 3-4 [j.. 

 crassis, 2-10-nis, rarius singulis vel plurimis in fasciculos apice 

 floccosos, 9-10 [1. diani. consociatis; articulis diam. 2-3-plo brevio- 

 ribus; contentu aerugineo-viridi; vaginis plerumque arctis, suffi- 

 cienter crassis, hyalinis, indistincte stratosis, superficie saepe opacis. 



Hah. in rivulo alpino prope «Ombla» Dalmatiie, socio Xeno- 

 cocco Kerneri Hansg. (Hansgirg). 



18. Hydrocoleus subcrustaceus Hansg. Alg. u. Bacter. Mittheil. p. 344. 787 

 — Strato pelliculari-crustaceo, 1-3 mm. crasso, saepe calce valde 

 incrustato et solido, hevi vel verrucoso-irregulari, brunneo-rufo, 

 sectione sordide cX^rugineo-viridi ; filamentis 2-10 consociatis, 3-4 {x. 

 diam., rarius singulis vel pluribus parallele decurrentibus, sursum 



