Annual report . 30, 1912. 44 NEW YORK STATE MUSEUM Crepis setosa Haller Point. Roy Latham, September 13, 1909. Cyperus ferax RichardsOrient Point. Roy Latham, September 30, 1912. Hypochaeris radicata Linn. Orient Point. Roy Latham, July 22, 1910. Also collected atCedarhurst, Nassau county, by G. D. Hulst, June 1897. Ibidium praecox (Walt.) HouseSalt marshes, Orient Point. Roy Latham, September 16, 1912. Onopordum acanthium Point. Roy Latham, September 30, 1912. Plantago decipiens Point. Roy Latham, August 1, 1909. Plantago elongata Point. Roy L
Annual report . 30, 1912. 44 NEW YORK STATE MUSEUM Crepis setosa Haller Point. Roy Latham, September 13, 1909. Cyperus ferax RichardsOrient Point. Roy Latham, September 30, 1912. Hypochaeris radicata Linn. Orient Point. Roy Latham, July 22, 1910. Also collected atCedarhurst, Nassau county, by G. D. Hulst, June 1897. Ibidium praecox (Walt.) HouseSalt marshes, Orient Point. Roy Latham, September 16, 1912. Onopordum acanthium Point. Roy Latham, September 30, 1912. Plantago decipiens Point. Roy Latham, August 1, 1909. Plantago elongata Point. Roy Latham, May 23, 1910. Salix caprea , Orient Point. Roy Latham, May 23, 1910. Cyperus grayii Torrey Orient Point. Roy Latham, August 8 and October 3, 1910. Alsocollected several years ago at Coney Island by C. H. Peck. Thereis in the State Herbarium, in addition, a specimen collected manyyears ago on Long Island by Mr H. Young. New Jersey is usuallygiven as the northern range of this species. Plate B. Hypertrophy of the Arbor Vitae (one-fifth natural size) AN ODD FORM OF HYPERTROPHY IN ARBOR VITAE BY HOMER D. HOUSE Plate B. Hypertrophic growths on the trunks or limbs of trees in theform of burls, abnormal accretions, etc, are familiar sights to every-one who gives any attention to trees. Rarely, however, is thereseen so remarkable a case of hypertrophy as is shown in the accom-panying illustration, which was taken from an Arbor Vitae(Thuya occidentalis) in Canada, by Dr J. M. of the State Museum. Various causes are ascribed to hypertrophic growths, the mostusual being: a Injury to the inner bark or cambium resulting in a stimulatedproduction of abnormal tissue, the abnormal growth once startedcontinuing to produce successive layers about its core. b Insect or fungus attack, stimulating the growing tissues intoabnormal growth at or about the affected portions. c Parasitic mistletoe attack, causing hypertrophy of the affectedtissues. Any of these cause
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