62 



ut mihi videtur, jure ad Anadyomeneas amandatur, Talarodictyon Endl. denique, ab auctore 

 Hydrodictyeis, a Kiitzingio Anadyomeneis dubitanter adjunctum, genus est maxime obscurum 

 et vix cognitum. 



Species unica: 



H. utriculatum. 



H. utriculatum Roth. tent. Flor. germ. III. (1800) p. 531; Catal. fasc.III. (IS06) p. 320. 



//. ma/us et tenellum Roth. Catal. fasc. I. (1SOO) p. 238 et 239. 



H. fientagonum Vaucher hist. i\. Conf. (1803) p. 88, t. 1, f. k ; t. 9, f. 1-10. 



Conferva reticulata Dill. L. (Rirht. Cod. p. 1073). 



Habitat in paludibus planitierum per totam Europam temperatam. 

 In Germania pluribus locis lectum est e gr. Regiomonti Borussiae, in fossis 

 nach dem Bretterkruge (Job. Loesel a. 1654); Vratislaviae (de Frantzius, 

 Cobn) ; Berolini (abunde in fossa Landwehrgrabcn !) et Postampii (Meyen); 

 Neodami (Itzigsohn); in agro Halensi (Wallr.), Jeverensi (Jiirgens), Got- 

 tingensi (Weis a. 1770), Erlangensi (Martins a. 1817), Gissensi (Dillen 

 a. 1719); in planitie Rhenana per terras Badenses prope Ladenburg et 

 Schriesheim (Mettenius), Carlsruhe, Eltlengen, Kippenhcitn, Freiburg (ad 

 Hugstetten et Riegcl) etc. In Bohemia (Opiz). In Helvetia: Genevae (Vau- 

 cber). In Gallia per Alsatiam (Mougeot et Nestler, W. Ph. Schimper), in 

 agro Aurelianensi inter Clery et St. Laurent -des-eaux (Guettard a. 1747), 

 in Delphinatn prope Gratianopolin (Villars 1789), Parisiis prope Versailles 

 (Thuret). In Italia: Yeronae, praesertim in oryzetis (Pollini), in agro Fici- 

 nensi (Balb. et Nocca); in Pedemontio (Allione, Cesati). In Hispania (Foy 

 sec. Morren). In Belgia: copiose prope Gandavum et Bruxellas (Morren) ; 

 in Hollandia (van den Bosch). In Anglia media et meridionali variis locis, 

 neque vero in Scotia et Hibernia repertum (Harvey) ; in fossis prope West- 

 inonaslerunn et in ericeto Hounsleiniano (Doody) ; in lacuna horti Chclseani, 

 quam Thamesis aestus replet (Dillen). In Dania (Kylling 1688), Gothia, 

 Suecia et Norwegia (Fries) e gr. in fluvio Upsaliensi Sahla (Linn. Fl. suec. 

 1745), prope Gothenburg (Areschoug). In Ruthenia circa Petropolin (t. Fries). 



Loco descriptionis fusioris plantae satis notae pauca et de retis integri 

 et de cellularum constituentium mensuris, variationi vix ullibi magis obno- 

 xiis, addam. Gonidiorum quidem magnitude satis constans est, plantae evo- 

 lutae vero moles quoad conditiones externas quam maxime variat, ita ut re- 

 tia aut majora, aut minora, e cellulis aut majoribus, aut minoribus coaiposita, 



