558 Myxophycefe, Scytonemacege, Desmonema. 



p. 373 (1827), Fl. Anhalt. II, p. 136, t. 5, f. I, Born. et Flah. Rev. 

 IIT, p. 83, Hansg. Prodr. II, p. 42 et in W. et N. Alg. exs. n. 757! 

 J. Schm. Cyan. dan. p. 104, c. ic, Schizothrix spongiosa Grun. in 

 Rabenh. Fl. europ. Algar. II, p. 270, Calothrix tenuissima A. Br. 

 in Rab. Fl. europ. Algar. II, p. 271, Symphyosiphon minor Hilse, 

 in Rabenh. Algen n. 1776, (fide Borneti) Cystocoleus minor Thur. 

 Ess. p. 381, Hilsea tenuissi ma Kivchn. Algenfl. von Schles. 1879, 

 p. 239, Borzi, Morf. in N. G. Bot. it. XI, (1879) p. 361. — Strato 

 membranaceo expanso, e filis intertextis formato; filis 4-6,5 [x. 

 crassis, parce ramosis; vaginis tenuibus, arctis, continuis, hyalinis, 

 longitudinaliter striolatis; trichoraatibus 3-4 {jl. crassis, monilifor- 

 mibus, pallide cTerugineis; articulis spha^rico-depressis; heterocystis 

 intercalaribus, suboblongis, circiter 4 (i. latis; sporis solitariis, 5-7 

 [j.. Intis, diam. usque 2-plo longioribus. 



Hai, ad plantas submersas GermanicB (Schwabe, Hilse, Kirch- 

 ner), fjohemice (Hansgirg), Wodorostow Polonia3 (Eichler), Suecine 

 (Lagerheim), Daniaj (Lyngrye), Indire (Turner), Fuegise (Borge). 



DESMONEMA Berk. et Thw. [1849 j Engl. Bot. Born. et Flah. Rev. 

 p. 126 (Etym. desm,e fasciculus et nema filum), Confervce, Tho- 

 rew, Oscillatoriw, Calotrichis, Scytonematis, Microcolei, Coleo- 

 desmii sp. auct. — Fila subdichotomice divisa; trichomata Sciepe 

 plura in vagina communi inclusa; heterocystie basilares; spor;e 

 majores, ovatae vel ellipticse, singulaj aut pauciseriatcie, interje- 

 ctcT3, exosporio crassiusculo. 



Obs. Plant;e aqua?. dulcis, ca^spitulos penicillatos efformantes. 



1. Desmonema Wrangelii (Ag.) Born. et Flah. Rev. III, p. 127, Hansg. isoi 

 Prodr. II, pag. 42, Setch. in Coll. Hold. et Setch. Phyc. bor. 

 Amer. n. 1081 Conferm vaginata Dillw. Brit. Conf. tab. 299, 

 p. p.? 1808, Thorea Wrangelii Ag. Disp. Alg. Suec. p. 40, 1812, 

 Oscillatoria Wimngelii Ag. Synops. Algar. Sueci*, p. 112, 1817, 

 Calothrix Wrangelii Ag. Syst. Algar. p. 71, 1824, Kuetz. Phyc. 

 gen. p. 229, Phyc. germ. p. 182, Sp. Alg. p. 311, Tab. phyc. II, 

 p. 8, tab. 29, f. IV, Rab. Deutschl. Kryptogamenfl. pag. 84, Fl. 

 europ. Alg. II, p. 272, Calothrix fontinalis Ag. Syst. p. 73, 1824, 

 Kuetz. Sp. Algar. p. 315, Breb. et God. Alg. de Fahuse pag. 25, 

 Scytonema cirrhosum, Carm. in Hook. Brit. Fl. II, p. 366, 1833, 

 Engl. Bot. tab. 2920, Harv. Man. pag. 155, Tolypothrix cirrhosa 

 (Carm.) Cooke Brit. Freshw. Alg. p. 270, t. CVIII, f. 3, Arthro- 



