OLITEB ON THE STEM OF DICOTYLEDONS. 305 



numerous medullary rays, small and narrow clusters and belts of 

 thick- walled, elongated, tapering cells, with dotted vessels. The 

 bark I have not seen. (D.O.) — Schleideu. Principles of Botany, 

 60, 62.— Henfrey, A. Micr. Diet. ' A¥ood.' 



TiLiACEAE. Kieser. Mem. Sur I'organisation des plantes, 1814, 

 tab. 17. Structure of TUisi.— Tllia. Mirbel. Sur I'origine, 

 &c. du Liber et du Bois. Mem. du Museum, 1828. xvi. 26, with 

 figs., also Elemens de Phys. Veget. tab. xiv. 19, 20. — 

 Mohl, H. V. Ueber d. Ban der porosen G-efasse der Dico- 

 tyledonen. Abh. Ak. Wiss. Miinchen, i. 445, with figs. — Link, 

 H. P. Icones Selectae, 1840. Fasc. ii. t. ii. 7-12.— Schultz, C. H. 

 Die Cyklose. Nova Acta. 1841. xviii. Suppl. ii. tab. xxxiii. 

 —Mohl, H. V. Bot. Zeit. 1855, 878. On liber of — Tlenfrey, A. 

 Micr. Diet. ' Wood.'— Schacht, H. Lehrbuch. i. 338. Der 

 Baum, 95, 199. 



Malpighiaceae. Martins, von. Gelehrte Anzeigen, 1842, 389. — • 

 Eichard. Nouv. Elemens de Botanique, 1846, 153.— Lindley, 

 J. Introd. Botany, i. 212. Pigure of liane-stem. — Criiger, 

 H. Bot. Zeit. 1851. op. cit. 465. An account of wood struc- 

 ture, with figures of Stigmaphyllon and Tetrapterys. — {Mal- 

 pighiaceae ?) Wigand, A. Einige Beispiele anomaler Bild- 

 ung des Holzkorpers. Plora, 1856, 673. With fig. — Banis- 

 teria. Gaudichaud. Guillemin's Archives, ii. 502 PI. 19. — 

 Banisteria paniculata. Molil, H. v. Ueber de Ban * * der 

 Eanken- und Schlingpflanzen. Tubingen, 1827, § 75. — Banis- 

 teria. Karsten, H. Vegetations-organe der Palmen, 1847, 140. 

 — Malpighia nitens. Link, H. P. Icones Anat. Bot. 1837. 

 Ease. ii. xi. 6-8. — Stigmaphi/llon. Gaudichaud. Eecherches 

 sur I'organographie, de des Vegetaux. tab. xviii. 11. — Jussieu, 

 Ad. de. Monograph des Malpighiacees, p. 100. Ann. d. sc. 

 Nat. Ser. ii. 15, 234. The stem in this order is always ligneous, 

 and either independent (especially the genera with fleshy fruits) 

 or a climbing liane (the greater portion of the winged-fruited 

 genera). In the liane species the wood, instead of present- 

 ing a continuous zone around the pith, is usually found to be 

 interrupted by prolongations of the cortical layers, which 

 extend sometimes to the centre and divide the stem into several 

 distinct fascicles, each invested by its proper, or by a common 

 bark. In others {Stigmaphyllon) the cellular tissue of the bark 

 forms a network extending to the medullary sheath, dividing 

 the wood circle into very numerous compartments, more or less 

 irregular in form and size. The wood is generally characterized 

 by the large development of dotted vessels. — In Byrsonima 

 coccolohaefolia, p. 101., an arborescent species, the structure of 

 the wood scarcely differs from that prevailing in Dicotyledons. 

 Numerous medullary rays of uniform thickness part from a 

 central pith. In cross section concentric zones, alternately pale 

 and dark, traverse the wood. In the former, dotted vessels pre- 

 ponderate, in the latter, thick-waUed prosenchyma. — BuncJiosia 



