. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 423 There are about fifteen species of these fungi, all but one of which have the aecidial or rust stage (Rcestelia) on some member of the tribe Pomese, generally apple, pear, or crab (Pyrus), quince (Cydonia), shad bush or service berry (Amelanchier), or hawthorn (Crataegus). The teleutosporic stage, which is commonly produced on hypertrophied parts in the nature of " cedar apples," witches' brooms, and other deformities of the host, generally occurs
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. PROTOBASIDIOMYCETES 423 There are about fifteen species of these fungi, all but one of which have the aecidial or rust stage (Rcestelia) on some member of the tribe Pomese, generally apple, pear, or crab (Pyrus), quince (Cydonia), shad bush or service berry (Amelanchier), or hawthorn (Crataegus). The teleutosporic stage, which is commonly produced on hypertrophied parts in the nature of " cedar apples," witches' brooms, and other deformities of the host, generally occurs upon one of the species of red cedar or juniper (Juniperus); only two species of these fungi are exceptions, these having as a host the related genus Cupressus. These fungi are of economic interest. Fig. 205. jEcidial Stage of Gvmnosporangium on Fruit of Haw because of the injuries to fruits and leaves of the Pomeae, and not as a rule because of serious injuries to the coniferous hosts. On account of the great similarity in development, the general facts of life history import may be collectively presented. More- over, since in the order of season the teleutosporic form occurs first, the discussion will follow this plan. Soon after the growing season begins, and following a warm rain, there will be found protruded from the cedar apples, or from enlargements on the twigs of other conifers mentioned, gelatinous, orange-colored spore masses, sometimes horn-like, and again almost shapeless. These masses consist, in large part, of orange-tinted. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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