Patterns of Endothecial Wall Thickenings in Araceae: Subfamilies Pothoideae and Monsteroideae
1985; Wiley; Volume: 72; Issue: 3 Linguagem: Inglês
10.2307/2443540
ISSN1537-2197
Autores Tópico(s)Paleontology and Stratigraphy of Fossils
ResumoAmerican Journal of BotanyVolume 72, Issue 3 p. 472-486 Article PATTERNS OF ENDOTHECIAL WALL THICKENINGS IN ARACEAE: SUBFAMILIES POTHOIDEAE AND MONSTEROIDEAE J. C. French, J. C. French Department of Biological Sciences, Rutgers University, P.O. 1059, Piscataway, New Jersey, 08854Search for more papers by this author J. C. French, J. C. French Department of Biological Sciences, Rutgers University, P.O. 1059, Piscataway, New Jersey, 08854Search for more papers by this author First published: 01 March 1985 https://doi.org/10.1002/j.1537-2197.1985.tb05371.xCitations: 27AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract A survey of the patterns of endothecial wall thickenings in 106 representative species from 20 genera in the Pothoideae and Monsteroideae was made using cleared anthers, sections and macerations. The wide variety of wall thickenings that is present is based on an annular-helical pattern. Variations in thickenings are related to differences in cell shape, cell orientation, intergradation between helical and annular patterns, pitch of helices, presence of branched thickenings, and various types of discontinuities in thickenings. Notable exceptions to the annular-helical pattern include Culcasia, which lacks a differentiated endothecial layer with thickenings, and Acorus, which has a peculiar stellate pattern that is unique in the family. No single pattern consistently characterizes either subfamily, although continuous helices are common in the Monsteroideae, and rare in the endothecium of Pothoideae (except Anadendrum). Monsteroideae frequently exhibit a series of slanted separate thickenings on anticlinal walls, which is absent from Pothoideae except in Heteropsis. The slanted pattern is considered a variation on a rectangular helix, involving discontinuities of thickenings on the periclinal walls. Some monsteroid genera show considerably more interspecific variation (Rhaphidophora) than others (Monstera). Endothecial thickenings constitute an anatomical character that is useful in the systematic study of Araceae; present results support other anatomical studies in identifying Culcasia and Acorus as highly divergent genera in the Pothoideae. Citing Literature Volume72, Issue3March 1985Pages 472-486 RelatedInformation
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