726 Conjugatse, Zygnemacese, Gonatoneraa. J 



Alg. p. 108, — Characteres Mougeotice; filamenta alternatim an- | 



gulato-genuflexa. Aplanosporse (agamosporse nec zygota) sine co- ? 



njugatione, tripartitione cellulse-raatris, ex media hujus parte ; 



forraatae. | 



1. Gonatonema ventricosum Wittr. loc. cit. p. 16, f, 1-13, et in Hedwi- 1732 1 

 gia 1879, p. 124. — Aplanosporis e fronte visis oblique ellipticis (la- )^ 

 tere uno magis quam altero convexo) apicibus truncatis, e latere ^ 

 visis ellipticis, apicibus truncatis, mesosporio levi, flavescente, 22- | 

 29 ^ 13-16 et 12-15 [).. crassis; cellulis vegetativis 5-7 ,u. latis, dia- J 

 nietro 6-16-plo longioribus. l 



Hab. in aquario magno caldarii horti botanici upsaliensis in \ 



Suecia (Th. M. Fries). | 



2. Gonatonema notabile (Hass.) Wittr. loc. cit. p. 16, f. 14 et in 1733 | 

 Hedwigia 1879, p. 1240, Cooke lirit. Freshw. Alg. p. 110, t. 44, i 

 f. 3, Mesocarpus noiabilh Hass. Brit. Freshw. Alg. p. 170, Stau- i 

 rospermum notabile (Hass.) Rabenh Fl. Eur. Algar. III, p. 261. | 

 Sirogonium notabile Kuetz. Sp. p. 434, Mougeolia notabilis Hass. | 

 in Ann. Nat. Hist. p. 46. — Aplanosporis e fronte visis genicu- 1] 

 lato-subcylindricis, (lalere uno convexo, altero concavo) apioibus 

 truncatis; cellulis vegetativis 12,5-15 p. hxtis, 5-6-plo longioribus. ^ 



Hab. ad u Notting Hill » in Anglia (Hassall). J 



SubfamiUa secunda Zygnemeae (Menegh.) De-Bary em. i 



Zygnemece Menegh. [1838] Cenni suUa organ. e fisiol. delle Alghe p. 33 era. j 



De-Bary [1858] Unters. ub. Conjug. pag. 70 excl. Mougeotia, Hansg. [1888] i 



Prodr. p. 153, De-Toni [1888] Consp. gen. Chloroph. in Notarisia III, n. 10, "; 



p. 453. • 



Thallus filiformis, e cellulis chlorophora tum 1-plura taeniaefor- i 



mia, parietalia, recta vel spiralia, margine irregulariter denticulata i 

 tura bina, asteriforraia, centralia foventibus, mombrana saepe incras- 



sata, mox diffluente (tegumentum gelatinosum plus minus amplum fili t 



haud raro prsebente) instructis constitutus. t 



Propagatio ut in Mesocarpeis. | 



Generatio zygotis e toto cellularum duarum conjugatarura ple- ; 



ruraque subconforraium i) contentu plasmatico contracto ortis; zygota ! 



* 



1) De diversitate cellularum conjugatarum in Zygnemeis confer, prseter ^ 



opera clarorum De-Bary, Wittrock etc, etiam A. W. Bennett Reproduction 

 of the Zygnemaceae in Journ, Linn. Soc. Bot. XX, 1883, p. 430-439. \ 



