File:The American journal of science (1899) (18150278172).jpg

Title: The American journal of science
Identifier: americanjournal481899newh (find matches)
Year: 1880 (1880s)
Authors:
Subjects: Science
Publisher: New Haven : J. D. & E. S. Dana
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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106 T. Holm—Studies in the CyperacefJB. But if we summarize the various causes of diseases and abnormal development as we know these in the Cypermceeey these do not seem to have been produced bj animals, neither as ekto- or endo-para- sites. It may, therefore, be of some, interest to report an instance where a Carex, C. stipata Muhl., had become infested by Lima vernalis Fitch,^ which had caused the foliar organs to develop very abnormally.t The specimens of this Carex we found grow- ing under natural conditions, in damp places in woods near Surratsville, Pr. George County, Maryland. They at- tracted our attention by the unusual size of the leaves, which furthermore were pure white excepting at the tips, which were pale green. The specimens afiected in this way were not, however, dis- eased throughout, as several normally developed shoots, floral and vegetative, were found on the same rhizomes that bore the hypertrophied. The accompanying illustra- tion (fig. 1) shows a part of a diseased specimen with the base of a normal flower-bear- ing stem and two abnormally developed vegetative shoots. Besides having attained an unusual width and being almost destitute of chloro- phyll, these hypertrophied leaves were furthermore flat io;e7reavesard7he base along their entire length with- stem, which is not out the usual tubular sheath, diseased; uaturai size. ^\^q larvge of the parasite y * The writer is indebted to Dr. Eng. A. Schwartz for the identification of Livia. \ Compare Buchenau Fr, Ueber KnoUen- und Zwiebel-bilduug bei den Juncaceen (Flora, 1891, p. 81).
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Fig 1. Carece stipata yL\x\\\. Diseased specimen, showing two leafy shoots with abnormally deve of a flower-beating

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