SYSTEMATIC BOTANY.

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considerably increased (Supplementum tentaminis Pteridographiae, continensgenera et species ordinum q. d. Marattiaeea:, Ophioglossaceae, Osmundace®Schizasaceee et Lygodiaceas. Pragse, 1845, 4to, pp. 119). The third part ofSir W. Hooker’s Species filicum is issued from the press, and contains twentyplates. J. Smith has separated some species of Oxygonium from the Archi­ pelago , as Syngramma (Lond. Joum. 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 andHepatic® (Zeitschr. fur wissenschaftl. Bot., Hft. 2, pp. 131-209), from whichhe arrives at the systematic conclusion, that the formation of the leaf ofMosses 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 individualcells ceases sooner at the point than at the base of the organ. Regardingtheir germination, Nageli remarks (p. 175), that it is the same as in theFerns; 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 thestem is formed from this tissue by the growth of numerous cellular threadsis contradicted.” However, in both families these parent-cells are onlycapable of growing upwards, whence it follows, that all the roots have alateral origin, but not, as Schleiden believes, that no roots are present. Justas the first axis of the Moss is developed from a parent-cell of the pro-embryo (germinal spore-filament of Nageli ), hi 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 notappear to possess this formative power, and are therefore the only true roots,according to Niigeli’s views.—Bruch and Sehimper, now in conjunction withGiunbel also, have published the genera Schistidium, Orimmia, and Racomi-trium, in four parts of their history of European Mosses (Bryologia Europaea.Faso., pp. 25-8. Stuttg., 1845,4to). Hampe has commenced an illustratedwork, with the following title : leones Muscorum Novorum v. minus Cog-nitorum (Dec. 1-3. Bonn., 1844-5, 8vo). C. Muller has given a reviewof Macromitrium (Botan. Zeit., 1845, Nos. 32, 33).—New genera; Oarckea,C. Mull, (ibid., p. 865), from Java ; from Chili, Leptochlana, Mont. (Cinq.Centurie de planches cellulaires exotiques nouv., hr Ann. Sc.Nat. iii, 4, p. 105),Aschistodon (ib. p. 109), Diplostichon (ib. p. 117), = Pterigymndnm 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.)

Hepatic^. —Of the ‘ Synopsis Hepaticarum,’ edited conjointly by Gottsche ,Lindenberg, and Nees v. Esenbeck, the second and third part appeared in1845, 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 arc distinguished in them; Acrobolbus N.