The natural history of plants, their forms, growth, reproduction, and distribution; . species of Cytisus (holopetalus, purgans, ephedroides,equisetiformis, candicans, albus, &c.). Most remarkably also this arrangementoccurs in a small species of Broom (Genista pilosa), which is distributed over themountains of Central Europe, over the heaths of the Baltic Lowlands, Denmark,Belgium, and England. And the presence of this contrivance here is the morestrange, from the fact that the green branches with their furrows, in which liestomata, are not leafless, but, on the contrary, are provided with a c
The natural history of plants, their forms, growth, reproduction, and distribution; . species of Cytisus (holopetalus, purgans, ephedroides,equisetiformis, candicans, albus, &c.). Most remarkably also this arrangementoccurs in a small species of Broom (Genista pilosa), which is distributed over themountains of Central Europe, over the heaths of the Baltic Lowlands, Denmark,Belgium, and England. And the presence of this contrivance here is the morestrange, from the fact that the green branches with their furrows, in which liestomata, are not leafless, but, on the contrary, are provided with a comparativelywell-developed foliage. Among the most peculiar plants whose stomata are concealed in hidden nooks. MAINTENANCE OF A FREE PASSAGE FOR AQUEOUS VAPOUR. 299 impenetrable by water, are two very small orchids, of which one, Bolbophyllumminutissimum, grows in company with mosses on blocks of sandstone and on thebark of trees in the rocky ravines near Port Jackson, and on the Richmond Riveron the east coast of Australia; the other, Bolbopltyllum Odoardi, lives in similar. Fig. 69.—Stomata in the Furrows of Green Stems. « Branch of Cytisus radiatus; natural size. 2 Portion of a branch; x 10. s Cross section of this branch ; x30. * Part of thesame section; xl50. s Branch of Casuarina quadrivalvis; natural size. « Portion of a branch; x8. Cross section ofthis branch; x30. 8 part of the cross section ; xl30. situations in Borneo. Both have a filamentous rhizome from which spring rootlets(from 2 to 5 mm. long and OS mm. thick), arranged in pairs, by which they attachthemselves to the stone and the bark of trees. Above the origin of each pairof rootlets is a little disc-shaped tuber, from 1^ to 3 mm. in diameter, and ^ , with an aperture on the upper surface, scarcely xV mm. broad, leading into ahollow chamber within the disc-shaped tubers, about 0-5 mm. broad and Ol (see figure 70). The leaves of Bolbophyllum minutissimum are reduced 300 MAINTENANCE OF A FRE
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
