Myxopliycese, Schizotricheae, Hypheothrix. 327 



Sectio A. Fila valde oontorta, vix flexilia, non sine ruptura extricanda. 



1. Hypheothrix calcicola (Ag.) Rab. Fl. Eur. Alg. II, p. 78, 1865, 798 

 Nostoc calcicola \g. Syn. p. 135, Syst. p. 19 (nec Breb.), Lepto- 

 thrix calcicola Kuetz. Phyc. gen. p. 200, Sp. Alg. p. 266, Tab. 

 Phyc. I, p. 41, t. 66, f. VI, Wolle Freshw. Alg. of U. S. p. 319, 

 tab. CCVIII, fig. 21, var. opaca Rab. exs. n. 1291 Oscillatoria 

 calcicola Ag. Disp. Alg. Suec. p. 37, Leptothrix muralis Heufl. 

 in Rab. exs. n. 1391 1 Hyph. calcicola forma opaca Rab. Fh Eur. 

 Alg. II, p. 78, non forma muralis ; H. calcicola forma dilute mru- 

 gineo-viridis Rab. 1. c, Leptothrix muralis A. Br. in Rab. exs. 

 n. 2459! Lynghya coriacea p parietina Richt. in W. et Nordst. 

 exs. n. 4901 Hyph. coriacea p parietina Stiz. (cfr. Hansg. Prodr. H, 

 p. 92), Lynghya calcicola Hansg. in Wittr. et Nordst. exs. n. 772, 

 et 774? Prodr. Bohm. II, p. 93, Dalla Torre et Sarnth. Fl. v. 

 Tyr. Vor. u. Liecht. p. 143, Hypheothrix muralis Richt. in H. et 

 Richt. Phyc. univ. n. 192! Schizothrix calcicola Gom. Monogr. 

 p. 307, t. VIII, f. 1-3, Coll. in C. H. et Setch. Phyc. Bor. Ara. 

 n. 557, Tilden On some Alg. Stalact. (Bot. Gaz. XXIV, 1897), 

 p. 197, t. VIII, f. 3-4. — Strato calce haud incrustato, subgelati- 

 noso, siccitate durissimo, tenui, papyraceo, membranaceo, nigro 

 vel rarius luteo-seruginoso ; filis abbreviatis, valde tortuosis et 

 dense intricatis raro pseudoramosis; vaginis firmis, subcartilagi- 

 neis, apice acuminatis vel ochreatis, initio subarctis, cylindraceis, 

 unicum trichoma includentibus, setate provecta crassioribus, sub- 

 lamellosis, ambitu irregularibus et erosis trichomata duo vel raro 

 plura includentibus, chlorozincico jodurato non cterulescentibus; 

 trichomatibus dilute aerugineis, ad genicula non constrictis, 1-1,7 [x. 

 crassis, articulis diam. trichomatis longioribus, 2-3 (raro 6) [x. longis; 

 dissepimentis interdum binis granulis refringentioribus notatis. 



Hah. ad muros, prsecipue caldariorum, Suecice (C. Agardh), 

 Germanine (A. Braun, Kirchner), Silesiie (Schroeder), Austriae 

 (RiCHTER, ScHiEDERMAYR, Hansgirg), Helvetia3 in lacu Morat (Fo- 

 rel), Bohemia^, IIIyri£e, Dalmatiie (Hansgirg), Italiae in collibus 

 Albanis ad Romam (Martel), ad Venetias (Zanardini), prope Ve- 

 ronam (Forti), ad Sirmionem paeninsulam Benacensem (Kirchner); 

 in Vogesis (Roumeguere), in Arvernia (Gomont), in ditione « York » 

 Angli?e (West), ad « HauHnam Meskoutine » Algeriiie (Sauvageau) ; 

 «National Park» Minn. (Tilden), «Georgia» in rupibus (Wood), 



