98 GonrervoidCcic, Ulvaccto, Mouostroma. 



formis, habitu lcrc Coleochceles sculalai [ncnus iuvestigatioiie ultcriore 



a cl. Reinkc mox illustrandumj. 

 Dermatophylon. Thallus hydrophilus, ad clypea testudinum vigcns, e ccUu- 



lis subquadraticis, polystromaticis constans. 

 'i Physodictyon. Thallus hydrophilus, vesiculosus, c cellulis angulosis paren- 



chymatice connexis constans. 

 ? Thermocoelium. Thallus hydrophilus, therraalis, vesiculosus. 

 i Epicladia. Thallus halophilus, investiens, zoophyticola [Geuus invcstigatio- 



ne ulteriore a cl. Reinko mox illustrandum]. 



MONOSTROMA Thur. [1854] Note sur la Syn. des Ulva iii Ann. de la 

 Societo des sciences naturelles de Cherbourg tom. II, p. 29 ern. Wittr. 

 [1866] Forsok till en rnonogr. ofver Algslagtet Monostrotna (Etym. 

 a monos solus et stroma) J. Ag. Tiil Algernes Systematilc VI, 

 p. 90, Farlow Alg. New Engl. p. 41, Kjellm. Alg. Arct. p. 294, 

 Hauck Meeresalgen p. 422, Ardiss. Phyc. Med. II, p. 188, De-Toni 

 e Levi Fl. Alg. Ven. III, p. 183. — Thalliis tenui-membranaceus, 

 basi adnatus, initio ssepe (forte semper) sacciformis, mox lacera- 

 tus et in lacinias foliaceas, irregulares transmutatus, demum ssepe 

 libere natans vel corporibus variis adfixus, e cellularum stratu uni- 

 co compositus; celiulse rotundat?e vel angulatoe, ssepe quaternatse, 

 prope basim ut plurimum elongato-clavatoe. 



Propagatio et generatio zoogonidiis ^) biciliatis e contentus cel- 

 lularum omnium froudis divisione ortis. Teste Bornet, cellulai zoo- 

 gonidiis farctae tum e thallo in gelatinam diffluente secedentes (/1/. 

 Wiitrockii, M. orbiculatum) tum poro aperta) nec secedentes [M. 

 Blyitii). 



Sectio 1. Eu-monostroma: [Monostroma (Thur.) ,1. Ag. Tili Algerncs Syste- 

 matik VI, p. 97]. 



Frons juvenilis saccata, demum (in plurimis) rupta lacerata, laciniis mo- 

 nostromaticis, nunc basi adhaorentibus, nunc et in plurlbus specicbus sub- 

 normalitcr separatis, liberis fluitantibus aut supra lundum cxpansis ; parie- 

 tcs cellularum constitucntium extrorsum demum gclatinosi, quasi spatia inter- 

 cellularia, vias intcr ccliulas arcasque ccllularum plus minus evidentcs men- 

 tientes, forraantes. Species dilute virescentes. 



A) Frons fcre tota in lacinias disrupta, laciniis separatis lluitantibus aut su- 

 pra fundum expansis. 



1) In .Vonostromate Wiltrochii Born., suadente ipso cl. Bornct, zoogonidia 

 sine copulationc novum tliallum germinant; in Monostromafe bulloso Wittr, 

 observante cl. Reinke, zoogouidia, etiam agaraice gcrminationi apta, possunt 

 intcr 8c copulare et tunc zygota 4-ciliata donarc. 



