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The anatomy and morphology of a representative each of the genera Chaetolepis and Monochaetum were studied from Costa Rica. Both species showed adaptations for inhabiting high elevations, especially Chaetolepis cufodontisii, which is the only representative of this mainly Andean genus in Central America and is restricted to the páramos of Costa Rica. The latter has amphistomatic, ericoid leaves with...
Previous research has shown that sunlight-induced bark formation (epidermal browning) on vertical surfaces of tall, long-lived columnar cactus species leads to premature death of entire plants. The bark cambium that produces bark for cactus species has been shown to involve proliferation of epidermal cells only. The purpose of this research was to understand (1) the characteristics of cuticles, epidermal...
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