The natural history of plants, their forms, growth, reproduction, and distribution; . ss rolled back, even whilst still hidden in the consequence of this, the lower side which faces the soil is hollowed to a greateror less extent, while the upper side, turned skyward, is arched. Frequently theleaf is rolled so as to inclose an actual chamber, which only communicates with theouter world by a very narrow fissure, as is the case, for example, in the Crowberry(Evipetrum). The rolled-back margins of the leaves in this plant almost touchone another, and the epidermis of the lower side of the
The natural history of plants, their forms, growth, reproduction, and distribution; . ss rolled back, even whilst still hidden in the consequence of this, the lower side which faces the soil is hollowed to a greateror less extent, while the upper side, turned skyward, is arched. Frequently theleaf is rolled so as to inclose an actual chamber, which only communicates with theouter world by a very narrow fissure, as is the case, for example, in the Crowberry(Evipetrum). The rolled-back margins of the leaves in this plant almost touchone another, and the epidermis of the lower side of the leaf forms the actuallining of the cavity which resulted from the rolling of the leaf (see fig. 71 ^). MAINTENANCE OF A FREE PASSAGE FOR AQUEOUS VAPOUR. 801 If the bent-back margins do not fit so closely together, a groove appears onthe under side of the leaf, which is more or less sunken according to the extent ofthe rolling, as for example in the Heaths {Erica caffra, vestita, &;c., see fig. 71 ^).Occasionally a groove is developed which divides into two side furrows running. s <?41p
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
