TILIACEÆ. 185 
trees; their liber also, on account of its great development and 
peculiarities, which render it solid and more or less textile, has often 
been studied and described.' The fascicles which constitute it are 
undulate and tangential between themselves, to the level of the 
summit of their most marked curvature, and they are more abundant, 
as the layers of liber are nearer the interior.?. The parenchyma is 
often the seat of abundant mucilaginous deposits, and here, as in a 
great many ÂMalvaceæ, we meet with special mucilaginous cells, 
in which there may be “the procreation of other cells, having 
their own stratification,”* and the plasma of mucilage may offer two 
aspects: “ sometimes it spreads itself round the cells, and sepa- 
rates afterwards into more or less numerous strata; sometimes it 
fills the whole cavity, and produces strata separating from the cir- 
cumference to the centre.” The particular cells in the middle of the 
mucilaginous liquid may in Zi/ia corallina give birth to nuclei, at 
first homogeneous, afterwards hollowed into a central cavity. From 
these facts T'rEcuL has concluded that in the Limes, as in many 
other Malvoidee, the mucilage “does not result from a metamor- 
phosis of the cellular membranes.” 
At most about three hundred and fifty species are known, of 
which two-thirds belong to the Old World. The Brownlowiee series, 
formed of fourteen or fifteen species, would belong entirely to the 
tropical regions of the Old World if it did not contain two American 
Carpodipteras. The Prockiee, on the contrary, are natives of tro- 
pical America, except Plagiopteron, which can only doubtfully be said 
to belong to these, and which is Indian. All the species of “/@ocarpus 
belong to the warm regions of the Old World; and all the Soaneas 
were formerly American; but it is necessary to associate with this 
genus the Asiatic and Oceanic species with imbricated calyx, compos- 
ing the section Lehinocarpus. All the species of Crinodendron were 

1 Upon these questions see Kieser, Mem. 
upon the Orig. of Plt. (1814), t.17,—Muns., The 
Orig. of Liber and Wood [in Mém. Mus. (1828), 
xvi. 26, fig.]; Elém. de Phys. Vég., t. xiv. 19, 
20.—H. Mout., Ueb. d, Bau d, Por. Gef. des 
Dicot. (in Abh. Akad, Wissench. Miinch., i. 
445, fig.); in Bot. Zeit. (1855), 878.—LINK., 
Ie, Sel. (1840), fase. 2, ii, 7, 12.—C. H. 
Scnuztrz, Die Cyclose [in Nov. Act, Nat. Cur. 
(1841), xviii, Suppl, ii. t. 33]. — Scxaour, 
Lehrbuch, i. 338; Der Baum, 95, 199.— 
Henrr., Micr. Dicr., art. Wood.—Outv., Stem 
in Dicot., 8. 
2 See Ricx., Hlém., éd. 7, 114, fig. 62. 
3 TrfcuL, in Adansonia, vii. 248. MEYEN 
believed the mucilage of the Limes to be con- 
tained in the intercellular channels, 
