Repository: UIHistories Project: Board of Trustees Minutes - 1884 [PAGE 129]

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133 of rest. The promycelium is rapidly formed under the proper conditions from the mature spores, and sporidia are abundantly produced. These latter are believed to develop only on species of Pomce, and produce the aecidial growths included under the socalled genus Eoestelia. This alternation of growth has been several times experimentally shown, but for the purposes of this paper the secidial forms are given by themselves. The mycelium of the teleutosporic form is sometimes annual, but more often perennial and produces remarkable gall-like distortions upon the host. "Spores yellow or orange colored, usually two-celled, occasionally one to six-celled, on long, hyaline pedicels, imbedded in a mass of jelly which, when moistened, swells into columnar or irregularly expanded masses. Mycelium parasitic in the leaves and branches of different Cupressinece, producing in them various distortions." (Farlow, Gymnosporangia of the U. S., p. 8.) G. macropus, Lk. Sporiferous masses aggregated in globose tufts, surrounded at the base by a ring formed by the raised epidermis and subepidermal tissue of the host-plant, orange-yellow, cylindrical, acuminate, half an inch to an inch long, or at times longer; spores ovate-acute, two-celled, generally constricted at the septum and with a papilla at the apex, 15-20 broad by 45-60 long; mycelium annual, producing globose or reniform knots in the smaller branches. On leaves and smaller branches of Juniperus Virginiana. (Farlow, Gymnosporangia of the U. S.,- p. 13.)

Genus CEONAETIUM, Fries. Teleutospores one-celled, without pedicels, compacted in an erect (often curved or bent) cylindrical, solid column; uredospores produced on pedicels, the uredosorus covered by a pseudo-parenchymatous membrane. The peculiar column, composed of the elongated teleutospores adhering closely to each other, and rising conspicuously from the substratum, clearly designates this genus. The uredospores and teleutospores, so far as is known, are produced on the same host, sometimes in the same sorus. C. asclepiadium, Kze., var. thesii, Berk. II and III. Uredosori small, scattered or collected in irregular groups, furnished with a peridium; uredospores subglobose to elliptical, echinulate, 15 by 18-26 n; teleutosori scattered, often numerous, column long, cylindrical, mostly curved, teleutospores cylindrical or oblong, yellowish brown, smooth about 11 /x. On Comandra umbellata. This is Cronartium comandrce, Pk. (Bot. Gaz. IV, p. 128.)