COLENSO'S 5EW-ZE1LAXD HEPATICjE. 271 



margine grosse dentata. Cellulae superficiales 0*025, basi ipsa 

 0*025 x 0*070 mm. Flores feminei in frondis facie antica prince 

 bifurcationi impositi. Involucrum tubulosum, carnosum, apice 

 laciniatum, laciniis inaequalibus lanceolatis acuminatis ; pistilla 

 6-8. Perianthium juvenile annuliforme, ore dentato. 



The cylindric involucre distinguishes this plant at once from 

 Symphyogyna, the pistils of which are merely covered by a scale, 

 free at the sides and inserted on the frond by its base alone, so 

 that it can be turned backwards without a rupture. Hymeno- 

 phyton, Dum., Podomitrium, Mitten, and Umbraculum, Gottsche, 

 have the flowers on postical branches. 



Each of these three genera presents two very different vege- 

 tative forms, viz. : 



a. The creeping form, as in Ilymenophytum phyllanthus, Sy?n- 

 phyogyna brasiliensis, and Pallavicinia Lyellii. 



b. The dendroid form with an erect pedicel and a more or less 



* 



umbelliform frond at apex, as in Ilymenophytum Jlabellatum, 

 Symphyogyna hymenophyllum, and Pallavicinia connivens. 



Dr. G-ottsche (in Ann. Sc. Nat. ser. 5, i. 1862, p. 177) created a 

 new genus, Miltenia, differing from Pallavicinia (Blgttia) by the 

 calyptra adhering to the base of the perianth. I have not seen 

 his plant ; but if there is no other difference, a separation from 



Pallavicinia is scarcely justified. In a flower of Pallavicinia 

 Lyellii we find the pistils at the base of the young calyptra; later 

 on they are found scattered over its surface, a consequence of the 

 growth of those cells which surround it at the base and on which 

 the pistils are inserted. A more enlarged activity of the basal 

 cells and a participation of the whole torus pistillorum will at 

 once bring the calyptra to adhere to the perianth. 



If, therefore, we separate Jlittenia from Pallavicinia, we 

 merely mark the intensity of a process which is going on in 

 both. 



Symphyogyna Hymenophyllum var. heterogena of Spruce (in 

 Trans. Bot. Soc. Edinb. xv. (1884) p. 536) is probably a Palla- 

 vicinia too (" flores stipite perbrevi valido carnoso suffulti," which 

 reads like the thick base of a young cylindric involucre). 



16. Eadula gkandis, Steph., s»p. n. (PI. XXVIII. figs. 1G, 

 17.) 



Sterilis, flavo-virens, robusta, flaccid a, Caulia 4-5 cm. longus, 

 vage multiramosus, ramulis regulariter pinnatis, pinnulis remotis 

 breviVus. Folia magna, dense imbricata, semicordato-ovata, 



