68 



Fam. III. LEMANE/E. 



3. LEMANIA Bortj. 



Char. Frond attached, coriaceous, ramose, and cellular. Outer 

 cells small, polygonal, and Jirmly adherent ; interior 

 larger, more lax, splicerical, and empty. Sporules mo- 

 niliform, fasciculate, naked, arising from the inner vesicles, 

 and occupying the interior of the frond. 



Lemania Bory, in Annales du IMuseum, vol. xii., also in 

 Diet, class, ix. 274. ; Agardh, in Act. Holm., 1814, t. 1. 

 species 1, 2. Nodularia Link, in Schrad. Jour., 1809, 

 p. 9. ; Lyngb. t. 29. Gongycladon I^ink, in Hort. 

 Physic. 6. Trichogonus Palis, in Jonr. Bot., 1808, 

 p. 123. (excel, sp.) Vertehraria Rouss, in Desv. Jour. 

 Bot. i. 143. Apona Adans. 13. PolyspcrmcB sp. Vauch. 

 t. 1. f. 3., t. 10. f. 1, 2. Conf sp. Dillw. t. 29. ; E. B. 

 1763. 



The genus Lemania, like some other genera of freshwater 

 AlgcB, would appear to stand almost alone, exhibiting no 

 very exact relation with any other division of this tribe, and 

 the only plant to which it bears any definite resemblance 

 appears to be the Enteromorpha intestinalis, and this only in 

 its ramose habit, and in tlie cellular structure of the frond, 

 the rej)roduction in Lemania, though simple, being wholly 

 different from that of Enteromorpha. 



Vaucher, in his description of his genus, Polyspcrma, of 

 which Conf. jiuviatilis formed the type, has not erred far from 

 the truth, and his generic name might, with propriety, 

 have been retained ; the chief mistake which he committed, 

 was in associating with Conf. jiuviatilis the Conferva glo- 

 merata, a plant in every way dissimilar to the former. 



The branches of tlie fronds of the Lemanice, in their young- 

 state, are cylindrical; soon, however, they are seen to be- 

 come dilated at regular intervals. If one of these dilatations 



