Myxoplayceae, Ilivulariaceae, Amphithrix. 601 



« Tromso, Ryoen Vikrau » (Foslie). — Adest etiaiii fonna calotri- 

 choidea seu plectoneniatoidea (heterocystis nullis). Propagatio hor- 

 mogoniis (synacynetis) 7-pluricellnIaribus rectis incurvisve, circ. 

 0,7 [J.. latis et pcr cellulas chroococcifornies circ. 2 [x. latas, glo- 

 • bosas, stratum tenue, difforme etllcientes filamenta Leptochcetes 

 vegetantibus. 



AMPHITHRIX Kuetzing [1843] Phyc. gen. p. 220 char. emend. (Etym 

 amphi, circum et thrix pilus), Born. et Fl. Rev. I, p. 344, Kuck 

 Bemerk. p. 263, f. 29, Chroolepi, Leptotrichis, Hijpheotrichis etc, 

 sp. auct. — Thallus crustiformis vel ca^spitosus, purpureus vel vio 

 laceus, e duobus stratis formatus: inferiore horizontaliter expanso 

 intricato, filamentoso vel e cellnlis minutis in lineas radiatas sub 

 seriatis contexto, superiore verticali, filis erectis simplicibus, hinc 

 iilinc in pilum mox evanescentem attenuatis constante. Vaginse 

 tenues, arctissinicO, continu». Hormogonia solitaria vel seriata. Spo- 

 rae ignotae. 



1. Amphithrix janthina (Mont.) Born. et Flah. Rev. I, p. 344, Hy in 1370 

 W. N. et L. Alg. exs. n. 1301! Chroolepus Janthinus Montagne 

 Phytograph. canariensis p. 188 (1840), Syll. p. 404, Leptothrix 

 janthina Kuetz. Sp. Alg. p. 363, Tab. phyc. I, p. 38, t. 60, f. 11, 

 Kalmus et Nave in Rab. Alg. exs. n. 15801 Hypheothrix janthina 

 Rab. ¥\. Europ. Algar. H, p. 76, Amphithrix amethystea Kuetz. Sp. 

 pag. 27B, Tab. phyc. 1, p. 49, t. 79, f. IV, Rabenhorst Fl. europ. 

 Algar. II, p. 229, Leptothrix amethystea Kuetz. in Botan. Zeitung 

 1847, p. 219. — Thallo tenni, crustaceo, amethysteo; filis 0,3- 

 0,5 mm. longis, l,.'j0 ad 2 2,5 [i.. crassis, erectis, strictis, purpu- 

 rascentibus, arctissime vaginatis; vagina tenui, uniformi; tricho- 

 matibus dihite serugineis; articulis diani. subaBqualibus; hormo- 

 goniis 20 [jl. longis. 



Rab. m lapidibus inundatis, ad parietes fontium Gallia? (Bre- 

 BissoN, BoRNET, B^LAHAULT, Hy), Italioe in fontibus S. Petri Roma? 

 (Martel), Bosnite et Hercegovinji3 (Schmidle), Austri(fi (Gastein, 

 Diesing), ad «Blansko» Moravite (Kalmus et Nave), Anglige in 

 ditione «York» (West), Algeria' (Sauvageau) insularum Cana- 

 riensium (Webb et Berthelot), Americse borealis (Collins). — 

 Var. torulosa (Grun.) B. et Flah. 1. c, Coll. in C. H. et Setch. 

 Phyc. bor. Amer. n. 262! Hypheothrix torulosa Grunow in Ra- 

 benhorst Fl. europ. Alg. II, p. 76, 1865; filis longioribus, usque 



