SYSTEMATIC BOTANY. 491 



considerably increased (Supplementum tentaminis Pteridographise, continens 

 genera et species ordinum q. d. Marattiaceas, Ophioglossacese, Osmundaceae 

 Schizseaceae et Lygodiacese. Pragae, 1845, 4to, pp. 119). The third part of 

 Sir W. Hooker's Species filicum is issued from the press, and contains twenty 

 plates. J. Smith has separated some species of Oxygonium from the Archi- 

 pelago, as Syngramma (Lond. Journ. of Bot., 1845, p. 168). 



MOSSES. Nageli has written a valuable memoir, entering fully into phy- 

 siological details, upon the growth of the vegetative organs in Mosses and 

 Hepaticae (Zeitschr. fur wissenschaftl. Bot., Hft. 2, pp. 131-209), from which 

 he arrives at the systematic conclusion, that the formation of the leaf of 

 Mosses is subject to a peculiar law ; the point of the organ is formed last, 

 the base first, by the formation of cells, whilst the growth of the individual 

 cells ceases sooner at the point than at the base of the organ. Regarding 

 their germination, Nageli remarks (p. 175), that it is the same as in the 

 Ferns ; in both, the axis is formed from a single parent-cell of the pro-embryo, 

 whence, " the earlier view that the pro-embryo forms a tissue, and that the 

 stem is formed from this tissue by the growth of numerous cellular threads 

 is contradicted." However, in both families these parent-cells are only 

 capable of growing upwards, whence it follows, that all the roots have a 

 lateral origin, but not, as Schleiden believes, that no roots are present. Just 

 as the first axis of the Moss is developed from a parent-cell of the pro- 

 embryo (germinal spore-filament of Nageli), in the same manner in Phascum, 

 for instance, the formation of new axes from certain capillary radicles (ger- 

 minal bud-filament of Nageli), whilst other similarly-formed roots do not 

 appear to possess this formative power, and are therefore the only true roots, 

 according to Nageli' s views. Bruch and Schimper, now in conjunction with 

 Giimbel also, have published the genera Schistidium, Grimmia, and Racomi- 

 trium, in four parts of their history of European Mosses (Bryologia Europaea. 

 Ease., pp. 25-8. Stuttg., 1845, 4to). Hampe has commenced an illustrated 

 work, with the following title : Icones Muscorum Novorum v. minus Cog- 

 nitorum (Dec. 1-3. Bonn., 1844-5, 8vo). C. Miiller has given a review 

 of Macromitrinm (Botan. Zeit., 1845, Nos. 32, 33). New genera; Garckea, 

 C. Mull, (ibid., p. 865), from Java; from Chili, Leptochlana, Mont. (Cinq. 

 Centurie de planches cellulaires exotiques nouv., in Ann. Sc.Nat. iii, 4, p. 105), 

 Aschistodon (ib. p. 109), Diplostichon (ib. p. 117), = Pterigynandrwtn longi- 

 rostrum Brid., and Encamptodon (ib. pp. 120-36. pi. 14); from Lord Auck- 

 land's islands, Sprucea W. J. Hook. = Holomitrium, Brid., and Lophiodon, 

 W. J. Hook. = Cynodon, Brid. (Antarct. Voy.) 



HEPATICLE. Of the 'Synopsis Hepaticarum,' edited conjointly by Gottsche, 

 Lindenberg, and Nees v. Esenbeck, the second and third part appeared in 

 1845, and the fourth part, which brings this important work to a conclusion, 

 in 1846, excepting a supplement which remains to be added (Hamburg, viii, 

 624 pp.) The following new genera are distinguished in them : Acrobolbus N. 



