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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1898 Excerpt: ... American Ferns--I: The ternate Species of Botrychium. By Lucien Marcus Underwood. The species now included in the genus Botrychium represent a clearly marked group of plants which are in many cases quite closely allied, a fact that has led to a considerable difference of opinion regarding the limits of the species. Two groups of the genus are made up of species that in their extreme forms approach each other, but still maintain certain characteristics of their own. So close is this approach that in the case of certain poorly preserved herbarium specimens it is difficult or sometimes almost impossible to distinguish the species, which in their living forms or even in well-preserved material are not to be confused. Of these two groups, one is composed of the species B. Lunaria, B. bortale, B. lanceolatum and B. matricariaefolium, which in America present a few peculiar modifications which are not, perhaps, of specific importance. The second group, known as the " ternata" group, is made up of the diminutive B. simplex in which two or more species have been confused, and the series of widely distributed but well-marked species that were confused with B, ternatum of Japan by Milde who has been followed more or less implicitly by English and American botanists. While it is evident that in some cases we must depend to a certain extent on habit and foliar cutting rather than on spore characters in order to separate the various species, in the great number of cases there are supplementary characters that will aid in their recognition. It is, of course, possible to assume a wide degree of variation in characters and Issued 15 October. ( 521 ) thus reduce the species of the world to a minimum, but it seems the more logical course to recognize as species those groups o...
    Dimensions7.4 x 0.1 x 9.7 inches

    American Ferns Volume 1-8

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