. Fungous diseases of plants, with chapters on physiology, culture methods and technique . s,since the uredo stage is produced practically throughout the winteron leaves of the basal rosettes. The spermogonia appear upon the needles in autumn, but theaecidia are not developed until spring. They occur on both sur-faces of the leaves in slightly discolored spots. They are crumpent, Fig. 212. Peridermium on Pine. (After Hartig) PROTOBASIDIOMYCETES 437 tongue-shaped bodies . mm. high, opening by an irregular rup-ture of the peridium. The spores are, according to Arthur, coarsely verrucose with
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . s,since the uredo stage is produced practically throughout the winteron leaves of the basal rosettes. The spermogonia appear upon the needles in autumn, but theaecidia are not developed until spring. They occur on both sur-faces of the leaves in slightly discolored spots. They are crumpent, Fig. 212. Peridermium on Pine. (After Hartig) PROTOBASIDIOMYCETES 437 tongue-shaped bodies . mm. high, opening by an irregular rup-ture of the peridium. The spores are, according to Arthur, coarsely verrucose with deciduous tuber-cles, except along one narrowHne, where tubercles fail. The uredospores are producedin orange-yellow sori, w-hich soonfade to nearly white. They aregenerally ellipsoidal, measuring27-30 X 17-22 yLt. The teleuto-spores are borne in crowdedwaxy masses, and are at maturitya chain of four basidial cells withina somewhat gelatinized commonwall. They are sessile, 55-80 x15-23/A, and the cell wall at theapex is generally swollen, oftenattaining a maximum thicknessof 30-40^0,.. Fig. 213. CoLEospoRiuM Senecionis[b after Tulasne) XXVIII. RUST OF POPLAR Melampsora tremulce Tul. Tulasne applied the above name to a rust of the poplar {Popuhistremidd) occurring throughout a considerable range in would seemthat this namewould now in-clude at leastthree forms, orspecies, as dis-tinguished byKlebahn, viz.,Melampsora PinitorqnaRostr., Mel amp so 7aLarici-tremiLlce Kleb.,and Melampsora Mag-mcsiana Wagn. These
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