Abstract

During the course of ecological survey studies on Mount Kenya (East Africa), carried out by members of the Oxford University Mount Kenya Expedition (1949), the author made an extensive collection of the pteridophytes inhabiting this mountain. Further specimens and data were provided by my colleague, Frank White. Mount Kenya is the eroded relic of an ancient volcano and rises from the Kenya Highlands at 5,000 feet elevation to a snow-clad summit just over 17,000 feet high. Its southern and eastern slopes receive an annual rainfall of over 55 inches; the northern slopes have a rainfall of under 25 inches per annum, being in the rain shadow caused by the peaks themselves. The eastern and western slopes receive a rainfall intermediate between these two values. The rainfall is seasonal, the two rainy seasons being from February to June and from September to January.

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