328 OEIGIKAL ARTICLES. 



broken up into isolated portions, vnth increase of the stem in 

 diameter. The annual (?) wood formations are regularly formed 

 of two broad, concentric belts, the inner vascular, the outer prosen- 

 chymatous. Medullary rays are numerous. (The conclusion of 

 the Santalaceae has not yet reached us.) — Chatin, A. Sur 1' Ana- 

 tomic des. Bull. Soc. Bot. iv. 978. The stem structure of the 

 following genera is described — Arjona, Quinchamalium, Naywdea, 

 Osyris, vol. v. 39. — Cervantesia. Anat. Comj). d. Yegetaux 

 (Parasites), tab. Ixxiii. 7, 8. Tlie text has not reached us. — 

 Osp'is. — Planchon. Bull. Soc. Bot. v. 289, 446, also in Compt. 

 Eend. July 20, 1858 and Ann. Nat. Hist. Ser. iii. 2, 225.— 

 Henslovia. Lindley, J. Bot. Eegister xx. 1686. The wood is 

 regularly zoned, filled with dotted ducts like those of JJlmus. — 

 Thesium. Pitra, A. ilber d. Anheftungsweise einiger phanerog. 

 Parasiten. Bot. Zeit. 1861, 69, with figs. 



Thtmelaceae. — Daphne. Link, H. F. Anatomia Plantarum, 1843. 

 Tab. viii. 6. A'arious forms of liber-cells. — Aquilaria AgaUocha? 

 'Aquila Wood.' Certain scattered cords of tissue, in section 

 elongated transversely to radius, traverse the wood (which ia 

 other respects agrees with the ordinary structure of Dicotyledons.) 

 Their muiute structure requires further examination. (D. 0.) 



Peoteaceae. — Dryandra, Hakea. Link, H. P. Icones Selectee, 

 1839. Fasc i. vii. 3-10.— Criiger, H. Bot. Zeit. 1851. 471. 

 Observations on structure of Rhopala. 



Aeistolochiaceae. Mohl, H. v. Ueber d. Bau * * der Eanken- 

 und Schliugpflanzen. Tubingen. 1827. § 75. — Aristolochia 

 lahiosa. Graudichaud, in Guillemin's Ai'chives, ii., 501, pi. 19. 

 1833. — J. Decaisne. Sin* les Lardizabalees. Arch, du Museum, 

 1839, i. 143, with figures. A. Labiosa, p. 152. The woody 

 bundles are formed of porous tubes of various diameter, irregu- 

 larly intermixed. Each bundle divides like the rays of a fan. 

 There is no trace of concentric zones. The liber occurs in iso- 

 lated fascicles, immersed in the cortical parenchyma, each corres- 

 ponding to a division of the wood mass. — .4. SipJio, p. 153. 

 Annual zones are obvious, owing to the formation of the wider 

 vessels in the early growth of wood of each year. The medullary 

 rays are numerous. The liber, at first continuous, becomes broken 

 up into bundles and isolated with age in the cortical cellular tissue. 

 — A. Clematitis exhibits an arrangement of woody bundles, 

 similar to that presented by A. lahiosa. — Lindley, J. Yeg. 

 Kingdom, 793, fig. — JSchleiden. Principles, 253. — Duchartre, P. 

 Compt. Rend. 1854, t. 38, 1141. — Asarum (1142), Bragantia 

 (114i2), Aristolochia (1143). The stem of -4. cgtnbifera, presents a 

 compressed inth, surrounded by a fibro-vascular zone, in the 

 fascicles of which the large vessels are irregularly scattered. The 

 liber-zone, at first continuous, is progressively divided into 

 numerous small bmidles, which do not stand in any relation of 

 number or position to the wood-bundles. — In A. Sipho the large 



