MyxophycetB, Scytonemacege, Scytonema. 527 



Meneghini). — Adest etiam var. Meneghiniana Kuetz. in Hohenb. 

 Heufl. Enum. Cryptoi;-. It. VenetcTe p. 316 nondum descripta. 



47. Scytonema involvens (A. Br.) Rab. Fl. Eur. Alg. H, p. 262, Born. 1216 

 et Thur. Not. Alg. p. 152, Born. et Flah. Rev. HI, p. 108, Hansg. 

 Prodr. II, p. 32, Symphyosiphon involvens Al. Br. in Hedwigia 



J, pag. 105, (1856), Rab. Alg. exs. n. 521! — Strato compacto, 

 crasso, spongioso, gehitinoso, sordide ;ierugineo, intus fus-^o; filis 

 dense intricatis in fasciculos coalitis, 2-3 mm. longis, 15-30 {j.. 

 crassis; pseudoramis erectis, adpressis; vaginis gelatinosis lamel- 

 losis, lamellis dilatatis, stratis internis luteo-fuscis, externis pal- 

 lescentibus, hyalinis, ambitu irregulariter intumescentibus; tricho- 

 matibus 6-12 [x. crassis, «ruginosis; heterocystis subglobosis vel 

 oblongis, carneo-lutescentibus. 



Hab. in stagnis, plantas aquaticas involvens, in Germania (Al. 

 Braun, M. Schmidt, Kiroiiner), Bohemia (Hansgirg), Austraha 



((tRUNOw). 



48. Scytonema crassum Naeg. in Kuetz. Sp. Alg. p. 894, Tab. Phyc. 1217 

 II, p. 7, t. 26, f. IV, Rab. Fl. Eur. Alg. II, p. 249, Braun in Alg. 



exs. n. 1813! Helwigia V, p. 58, Bornet et Flah. Rev. III, p. 109, 

 Scytonema Bangii Knetz. in Actien 18361 non Species Alg. p. 324, 

 — Strato pulvinato, expanso, spongioso- tomentoso, nigro-vire- 

 scente; filis basi contortis, flexuosis, erectis, inillim. longis, 27- 

 45 [X. crassis; pseudoramis erecto-adpressis; vaginis oclireatis, 

 multipliciter lamellosis, lamellis dilatatis, stratis internis luteis, 

 mediis fuscis, exterioribus pallidioribus; articulis subquadratis aut 

 globosis. 



Hab. ad terram, rupes et muscos Gallige (Bornet et Flahault}, 

 HelvetiaB (Al. Braun, Naegeli, Bornet), Tyroline (Heufler, Ra- 

 BENHORST), Italije (Meneghini) et Ceylon^e (Grunow). 



49. Scytonema densum (A. Br.) Bornet in Born. et Thur. Not. Alg. 1218 

 p. 152, Born. etFlah. Rev. III, p. 109, Arthrosiphon densus AI. Br. 



in Kuetz. Sp. Alg. p. 894, Tab. Phyc. II, p. 8, t. 28, f. II, Rab. FI. 

 Eur. Alg. II, p. 266. — Strato dense pulvinato, fusco-nigrescente; 

 filis intricatis, millim. longis, 24-40 ;j.. crassis; pseudorainis ere- 

 cto-adpressis ; vaginis luteo-fuscis, gelatinosis, confuse lamellosis, 

 junioribus pallidis, luteis; trichomatibus 6-12 (x. crassis, viridlbus; 

 heterocystis subquadratis. 



Hab. ad rupes madidas Helvetiai (Al. Braunj, Austrire (Heu- 

 fler), Californiae (Koch F. W.), Jamaic^e (Collins). — Var. stri- 

 Ctum A. Braun in Rab. Fl. Eur. Alg. p. 266: trichonatibus stri- 



