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- W2331551246 abstract "Considerable diversity exists in the structure of fern rhizome scales. Although the more conspicuous features of scales have long been used in describing and identifying some groups of ferns, the more detailed aspects have generally been ignored. Mlodern monographs and treatments on ferns have contributed to a better understanding of the value scales may have in the interpretation of evolutionary relationships. The object of this paper is to describe some of the rhizome scale features of Platycerium that seem to be helpful in determining the evolutionary trends within the genus. Some similar features have been pointed out by Wagner (1952, p. 77) in the genus Diellia. Before the rhizome scales could be studied for structures that might be of phylogenetic value, it was necessary to determine first the probable evolution of the Platycerium species. For this, I used a variety of characters other than those of the rhizome scales. Reliable characters included stele types, sporangial arrangement, nature of the sporangial stalk, and completeness of the annulus. Only after I had arrived at the probable evolution of the species did I examine the rhizome scales in detail to determine how their features correlated with the patterns I had determined. The three main lines of evolution are summarized in Table I. The Afro-American line includes P. andinum and two branches both starting from P. quadridichotomum. One branch ends in P. angolense and the other branch ends in P. ellisii. The sequence of species in the other two lines is essentially linear, as listed. In selecting rhizome scales for study several factors must be kept in mind. The scales on individual plants vary, but species differences are usually consistent, providing the factors of the age of the plant, weathering, and selection of a typical scale from the sampling are taken into consideration. Immature or small plants" @default.
- W2331551246 created "2016-06-24" @default.
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- W2331551246 date "1970-10-01" @default.
- W2331551246 modified "2023-09-26" @default.
- W2331551246 title "The Rhizome Scales of Platycerium" @default.
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- W2331551246 doi "https://doi.org/10.2307/1546354" @default.
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