Confervoideae, Ulvaceie, Monostroma. 99 



* CoIIuUb laeiniarum separataruni evidontius bi-ter- aut quaternatim juncta3. 



1. Monostroma bullosum (Roth) Wittr. Monostr. p. 28, t. 1, f. 1, J. 254 

 Ag. Till Algern. Syst. VI, p. 97, Reinke Ueber Monostroma bul- 

 losum und Tetraspora lubrica, Ulca bullosa Roth Catal. III, p. 

 329, Ag. Sp, p. 414 nec Hassall, Uloa Laciuca /3. Huds. Fl. Angi. 



p. 567 nec alior., Tremella Lactuca var. a Gmel. Hist. Fuc. p. 21G, 

 Tremella palustris Web. Spec. fl. Goett. p. 217, Ulva minima 

 Vauch. Hist. Conf. p. 243, t. 17, f. 1, Tetraspora minimaBesy. 

 Obs. plant. d' Ang. p, 17 nec Ag,, Teiraspora bullosa Kuetz. Phyc. 

 germ, p. 153, Sp. p. 226, Tab, Phyc. I, t. 28, f. 1, Rabenh. Alg. 

 Eur. n. 1233. — Thallo callo radicali adnato, initio saccato, de- 

 inde dehiscentiae causa membranaceo, valde tenui flaccidoque, lu- 

 brico, intense viridi; cellulis rotundato-semicircularibus, geminis 

 vel quaternis, in substantia intercellulari copiosa laxius dispositis, 

 in sectione thalli transversa horizontaliter ovalibus vel ovatis, 3,5- 

 5 [J: altis, contentu chlorophylloso omnino repletis. 



Hab. in aquis dulcibus in Suecia (Wahlenberg, Areschoug), in 

 Helvetia (C. Agardh), in Neerlandia (Rabenhorst), in Gallia (Thu- 

 ret), in Vogesis (Mougeot et Nestler), in Anglia (Dillbnius) et 

 Hibernia (Mackay). — A Tetraspora gelaiinosa caute dignoscen- 

 dum. De zoogonidiis cfr. p. 93 in notula. 



2. Monostroma lubricum Kjellm. Om Spetsberg. Thallophyter II, p. 48, 255 

 t. 4, f. 8-9, Alg. Arct. p. 295. — Thallo membranaceo, pallide 

 vel albido-viridi, tenui, valde lubrico flaccidoque, forma irregulari, 

 laciniato, plicato, margine crispo et lacerato, 18-22 p.. crasso; 

 chlorophoris lumina cellularum explentibus, in sectione thalli trans- 

 versa horizontaliter ovatis vel oblongis, 4,5-8 ja. altis, a superficie 

 thalli visis circularibus, rotundato-semicircularibus vel angulari- 

 bus, subrotundatis, sfepe geminis vel quaternis, membranae parte 

 cellularum superficiali crassiori. 



Hab. ad aFairhavn» Spitzbergiae. — Thallus 15 cm. longus, 

 fere ita latus. 



3. Monostroma laceratum Thur. Note sur la Syn. des Ulva pag. 32, 256 

 Wittr. Monostr. p. 30, t. 1, f. 2, J. Ag. Till Algern. Systera. VI, 



p. 98, Cooke Brit. Freshw. Alg. pag. 131, t. 51, f. 6. — Thallo 

 membranaceo, denique libero, tenui flaccidoque, pallide viridi, for- 

 ma irregulari, rugoso, margine plano erosoque vel crispo, 40-55 

 u. crasso ; cellulis rotundatis, geminis, ternis vel quaternis, in sub- 

 stantia intercellulari copiosa laxius dispositis, in sectione thalli 



