730 Conjugata", Zygnehiacese, Zygnema. 1 



5. Zygnema leiospermum De-Bary in Rabenh. Alg. N, 638!, Conjug. i"39 j 

 p. 77. t. f. 1-14, Fl. Eur. Algar. III, p. 249, Kirchn. Alg. Schles. | 

 p. 125, Cooke Brif. Freshw. Alg. p. 82, t. 31, f. 2, Wolle Freshw. ' 

 Alg. U. S. p. 222, t. 143, f. 1-3. — - Caespitibus laete viridibus, siccis j 

 sordide viridi-fuscescentibus, intricato-crispatis; cellulis sterilibus | 

 20-22 IX. latls, diametro aequalibus, paullo vel duplo longioribus, « 

 fructiferis modice turaidis, nonnunquam abbreviatis ; zygotis globosis \ 

 vel late ovalibus, 23-30 a. diam. aequantibus. 1 



Hab. in fodinis aqua pluviali repletis ad Friburgum brisgo- 4 

 vieuse (A. De-Bary) aliisque Germaniae locis (Kirchner), in Bri- 



tannia (CooKE), in America boreali (Wolle). ; 



6. Zygnema insigne (Hassall) Kuetz. Spec. Alg. p. 444, Tab. phycol. 1740 j 

 V. t. 17, f. 1, De-Bary Conjug. p. 78. t. VIII, f. 14-16, Rabenh. | 

 Fi. Eur. Algar. III, p. 249, Kirchn. Alg. Schles. p. 125, Cooke Brit. | 

 Freshw. Alg. p. 83, t. 31, f. 3, Wolle Freshw. Alg. U. S. p. 223, l 

 t. 143, f. 4-6, Tyndaridea msigms Hassall Freshw. Alg. p. 163, ^ 

 n. 5, t. XXXVIII, f. 6 et 7, Zygnema tenue Rabenh. Alg. n. \ 

 674. — Csespitibus laxe intricatis, saturate viridibus; cellulis vegeta- I 

 tivis 26-30 jj.. latis, diametro sequalibus vel duplo circiter longiori- t 

 bus, cylindricis vel unilatei"ali-inflatis ; conjugatione ssepe laterali \ 

 una cum scaliformi; zygotis globosis, 26 5 32 vel circ. 30 ^. diam,, i 

 membrana permanenti inclusis. I 



Hab . ad fiuminum ripas et in stagnis Anglice ( Hassall , \ 



Jenner), in Germania, prope (cSchaffhausen» ad cataractani Rheni \ 



(L. Rabe^nhorst), ad «Pozze di Renco» in Italia (Martel); in i 



America boreali (Wolle). i 



Sectio 2. Scrobiculospermum (De-Bary) Hansg. in Hedwigia 1888 p. 258. 1 



Membrana media zygotorum ovoideorum vel globosorum verrucosa, & sub- | 



tiliter vel lacunoso-punctata vel scrobiculata, fusca, aureo - vei castaneo-fu- | 



scescens; conjugatio cellularum fructiferarum scaliformis vel lateralis. t 



7. Zygnema stellinum (Vauch.) Ag. Syst. p. 77 ampl., De-Bary Con- 1741 ' 

 jug. p. 78, Rabenh. Alg. 184, 552, Fl. Eur. Algar. III, p. 249, •< 

 Hansg. Prodr. p. 154 (f. genuina), Zygnema cruciaium Kuetz. 

 Alg. exsicc. n. 47 nec alior., Thtoaitesia Duriei Mont. Fl. d'Al- 

 g6rie p. 175, t. XV, f. 1. — Ca^spitibus laxe intricatis, viridibus, 

 dein fuscescenti-brunneis; cellulis vegetativis 25-36 //. latis, diame- 

 tro 1-3-plo longioribus, fructiferis subinflatis, vix abbreviatis; zy- 

 gotis globosis oblongisve, 35-48 ^i 30-35, mesosporio foveolis rotun- 

 datis ornato, maturitate fuscis. 



