Repository: UIHistories Project: Board of Trustees Minutes - 1884 [PAGE 100]

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104 Cooke (Proceedings Portland Soc. Nat. Hist. Vol. I., part II., p . 184) described, under the name Uromyces triqnetra, a species on Hypericum and questions its identity with the plant described by Schweinitz. Peck (25th Eep. p. 74) adopts the name given by Cooke, but Farlow (Ellis',N. A. Fungi 231) uses for what seems to be the same, Schweinitz's name. In the exsiccata specimens of Ellis' and the Illinois collections sori also occur on the stems; in this differing from Cooke's description of U. triqnetra; and the spores are not commonly angular, certainly not usually three sided. The above description is drawn from specimens on Elodes Virginica. On Hypericum mutilum the sori occur on both stems and leaves^ are smaller and rounded and the spores are rather smaller and lighter colored. U. terebinthi, (DC.) Wint. Amphigenous, spots yellow or yellowish red or none, usually small; sori minute, scattered or crowded, soon naked. II. Spores elliptical, often roundish or oblong, usually obtusely pointed, covered with spiral lines of minute warts or beads, yellowish brown, 25 by 25-40 //, on a short hyaline deciduous pedicle. III. Spores vertically compressed, or globose, with an obtuse, cap-like point; verrucose with prominences in short, irregular, undulating lines; dark brown; about 25 & long (vertical dimensions) and 30 & wide; pedicles hyaline, stout, prominent, several times as long as the spore. On leaves, petioles and stems of Rhus Toxicodendron. This is often referred to the genus Pileolaria, Cast.; but mycologists are pretty well agreed (Leveille, Tulasne, Winter, Farlow, etc.) that the plant is not generically distinct from Uromyces. This being admitted, a further question comes upon the specific distinction of the American plant on Rhus from the European one on Pistacea, an allied genus. Ours was published in Eavenel's Fungi Car. Sup. (1855) under the names of Uredo toxicodendri, Berk. & Eav., for the uredoform and Pileolaria brevipes. Berk. & Eav. for the teleutoform, and the latter name has been commonly used, though the significance of the specific appellation is unintelligible or incorrect, for the pedicels are conspicuously long. Upon comparing specimens and descriptions of European and American plants, it does not appear that the latter can be maintained as a distinct species, hence the name previously given to the former has here been adopted (Uredo terebinthi, DC. Flore Franc. [1815] VI, p . . 71). The teleutospores are not at all different, but in the poor specimens at hand of the European uredospores the spiral arrangement of the prominences can not be so well made out. However, Schroeter (Hedwigia XIV, [1875] p. 170) does not find any difference between them. Doubtless there is none. It is peculiar that a difference of opinion should exist as to which of the forms is the teleutospore. In these specimens the yellowish, fragile-stalked form appears alone in the collections of July; in those of August, this is well scattered, but present, while the thick-walled, long-stalked form may be found in sori still mostly covered by the epidermis, and later (October) this last is found alone.