A text-book of mycology and plant pathology . with pustules. (After Jones andBartholomew, Bull. 257, Agric. Exper. Stat., Univ. Wise, July, 1915.) celled teliospores are formed. The aecia occur on two species of shadbush: Amelanchier canadensis and .4. intermedia (Fig. 73). In Gymnos porangium nidus-avis, the telia arise from a perennialmycelium which often dwarfs the young shoots and causes birds-nestdistortions in which usually there is a reversion of the leaves to thejuvenile form, sometimes causing gradual enlargements in isolatedareas on the larger branches of Juniperus virginiana with ae
A text-book of mycology and plant pathology . with pustules. (After Jones andBartholomew, Bull. 257, Agric. Exper. Stat., Univ. Wise, July, 1915.) celled teliospores are formed. The aecia occur on two species of shadbush: Amelanchier canadensis and .4. intermedia (Fig. 73). In Gymnos porangium nidus-avis, the telia arise from a perennialmycelium which often dwarfs the young shoots and causes birds-nestdistortions in which usually there is a reversion of the leaves to thejuvenile form, sometimes causing gradual enlargements in isolatedareas on the larger branches of Juniperus virginiana with aecia onseveral species of Amelanchier (Fig. 73). Juniperus communis is the host of the telial stage of G. clavaricEforme,which appears on long fusiform swellings of various-sized branches,14 2IO MYCOLOGY scattered, or aggregated and its aecia on seven species of Amelanchier,one each of A ronia and Cydonia. Gymnosporangium Ellisii (Figs. 74 and 75) in its telial form distortsthe younger branches of the white cedar, ChamcBcyparis thyoides, pro-. FlG. 80.—Roestelia, or aecia on apple leaf. {After Giddings and Berg, Bull. 257,Agric. Exper. Stat. Univ. Wise, July, 1915.) ducing numerous fasciations. The scia and pycnia of this fungusare on Myrica. Gymnosporangium globosum is remarkable in formingaecia on eighty-five different species of hawthorn, Cratagus, while its RUST FUNGI 211 (eliospores appear on irregular spheric swellings or excrescence onJunipenis virginiana. The mycelium of G. JHmperi-virgmiancB is annual, or biennial,producing globose swellings known as cedar apples on the leaves of the
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