Description of a new Pseudostaurosira based on “Fragilaria virescens f. parva” from Erbario Crittogamico Italiano [* Cross-Reference *]

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Williams, David M.; Wetzel, Carlos E., 2019, "Description of a new Pseudostaurosira based on “Fragilaria virescens f. parva” from Erbario Crittogamico Italiano [* Cross-Reference *]", https://lore.list.lu/citation?persistentId=perma:LIST.MXPHS6, LIST Open Repository, V1
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Description
Normally thought of as a cosmopolitan species, Fragilariforma virescens (Ralfs) D.M.Williams & Round has been recorded widely, its occurrence noted in many regional floras. Since its description in 1843, the species has been sub-divided a number of times, yielding over 80+ names of varieties and forms that have been recorded in various printed and online catalogues of diatom names. Some of the names in these catalogues are inadvertent duplicates, or obvious synonyms, etc., but once redundancy is excluded, one must presume that the remaining infra-specific names were invoked to represent some quantifiable deviation from the nominate species–at least as understood on the part of the investigator who created the name. What these names might be, what they might represent, irrespective of the vague nature of the meaning behind many of infra-specific categories, is worth exploring. Resolution might be achieved, to a certain degree at least, by examining any type specimens attached to each of these apparent infra-specific names, should the specimens still be available. Is it worth the effort? Avoiding a direct answer to that question here, one outcome of these kinds of searches, along with discovering new and undocumented taxa, is to throw up various nomenclatural problems. One is highlighted herein. (2019-01-01)
***This entry has been automatically imported via Infodoc(ASO) CSV by LIST harvest scripts. Please refer to https://doi.org/10.1080/23818107.2019.1668296 for the original and latest version of the dataset and data downloads*** (2025-12-04)
Subject Other
Keyword Bacillariophyta, diatoms, Pseudostaurosira, SEM, type material, ‘araphid’ diatom
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