The natural history of plants, their forms, growth, reproduction, and distribution; . igure 70). The leaves of Bolbophyllum minutissimum are reduced 300 MAINTENANCE OF A FREE PASSAGE FOR AQUEOUS VAPOUR. to tiny pointed scales about ^ mm. in length; two of them are situated at themouth of each cavity, and are inflected towards one another across it. In Bolbo-phyllum Odoardi, each of the small tubers bears only one small green leaf, whichis about 1^ mm. long and 1 mm. broad, and is placed close to the opening of thechamber (see fig. 70*^^). Stomata are found exclusively in the interior of thehol
The natural history of plants, their forms, growth, reproduction, and distribution; . igure 70). The leaves of Bolbophyllum minutissimum are reduced 300 MAINTENANCE OF A FREE PASSAGE FOR AQUEOUS VAPOUR. to tiny pointed scales about ^ mm. in length; two of them are situated at themouth of each cavity, and are inflected towards one another across it. In Bolbo-phyllum Odoardi, each of the small tubers bears only one small green leaf, whichis about 1^ mm. long and 1 mm. broad, and is placed close to the opening of thechamber (see fig. 70*^^). Stomata are found exclusively in the interior of thehollow tubers. Water cannot enter through the narrow mouth into the air-containingchamber, and even when, in the rainy season, the whole of the mossy carpet, inwhich these smallest of all orchids are interwoven, is saturated with water, theirtranspiration continues unhindered, provided that the other conditions on which itdepends are fulfilled. It is obvious that these structures which prevent moisturereaching the stomata during the wet season of the year can take on another function. ^^
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1902
