The Microthyriaceae of Porto Rico
1924; Taylor & Francis; Volume: 16; Issue: 4 Linguagem: Inglês
10.1080/00275514.1924.12020438
ISSN1557-2536
Autores Tópico(s)Diatoms and Algae Research
Resumono generalizations are yet possible regarding the origin of this group. The forms of Porto Rico in general show less diversity than those of Hawaii, most of them belonging to such well known genera as Asterina and Morenoella. Some of the species agree sufficiently with printed diagnoses to warrant the assumption that they are co-specific with previously described forms, while others must be regarded as new species or even as belonging to new genera. The taxonomy of this group as based on the morphology of the forms previously known is summarized in two extensive articles, one by Theissen and Sydow (1), and the other by G. Arnaud (2). The system of Theissen, based as it is so largely on spore septation and color, is distinctly artificial in character, while that of Arnaud is based on more fundamental morphological characters, though lacking, of necessity, in ease of application. The pertinent portion of Theissen's key is reproduced. The material used in this study consisted of specimens collected by Dr. F. L. Stevens in Porto Rico during the years 1913, 1914, and 1915.
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