268 DH. LAUDEE TjI^'DSAT Oy ARXnOXIA MELASP£IIMELLA. 



Hab. Common all over Bengal!; Ceylon, Thwaites; Shanghai, D. 



Maingai/y ^o. 674 ! ; Java, 

 Distr. Europe!; Egypt; Asia; North America. 

 Var. i3. con co/or,frondiculis multo majoribus a])ice acutiusculis utriuque 



laete viridibus. 



This pretty variety occurs In Bengal occasionally, in very clear 

 water, under the shade of trees. 



§ 2, Staurogeton. Prondiculse monorrhizse, cmeiatim connatse, 



submersse. {Staurogeton^ Echb.) 



4. Lemi 



mild. 



Worn Monogr. 20, t. 1-3 



Bieb. Flor. u. 378; Engl Bot. t. 926; Flor. Dan. t. 1586; Mert. et 



Koch, Germ, i. 294 ; Koch, Syn. Germ. 680 ; Kth. Berol n. 300 ; ejusd. 



En.iu. 5 ; Schleid. in Linn. xiii. 391 ; Miq. Fl. Ind. Bat. iii. 222. 

 Lenticula trisulca. Scop. Cam, no, 1143, 

 Staurogeton, Rchb. Consp. 44. 

 Lemna intermedia. Rathe. 

 Lemna cruciata, Rocb. Fl. Ind. iii, 566. 

 Hab. Bengalj common in standing waters !; Peshawur valley, common. 



Dr. Stewart ; Indian archipelago ? 

 Distr. Europe ! ; Asia ; North America, 



Species escludenda. 

 Lemna obcordata. Ham. Heri. in Wall. Cat. 5201 : Marchantiaceae. 



On ArtJionia melasperjiella, Nyl., nov. sp. By "W. Laxtdeb 



LiNDsW, M.D., P.E.S. Edin., &c. 



(Plate VI.) 



[Read Dec. 7, 1865.] 



and 



considerable interest to botanists. Xot only is it a species new 



an 



group 



racters 



Lichenologists 



varying views of Pungologist 



know of no certain or satisfactory means of 

 y of the lower Lichens from many of the 

 lower Enngi, and until, at least, botanists have discovered some 

 diagnostic characters of a sufficient kind, I think it would be well 

 to classify plants so dubious in their characters in a transition or 



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