A Text book of Plant Diseases Caused By Cryptogamic Parasites
The book A Text book of Plant Diseases Caused By Cryptogamic Parasites was written by author George Massee Here you can read free online of A Text book of Plant Diseases Caused By Cryptogamic Parasites book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Text book of Plant Diseases Caused By Cryptogamic Parasites a good or bad book?
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Peridermium conorum, 'Thum. =j4ecidiur/i conorum-piceae^ Reess. The aecidia are large, appearing on the outer surface of cone bracts of the spruce, few in number (but not constantly two). Peridermium elatinum, Wallr. This species grows on silver firs, forming cankered swellings on the trunk and PINE CONE FUNGUS 267 branches. From these swollen spots abnormal branches, ' witches' brooms, ' often spring, and are readily recognised at a distance by growing quite erect, and in the much smaller yell...owish leaves which fall off about the end of August, the ' witches' broom ' being deciduous. Aecidia are only formed on the ' witches' broom ' leaves, and not on the swollen portions of the branch, as in other species. The bark is ruptured and thrown off at the cankered swellings, which consequently often serve as a starting- point for wound-parasites, especially Polyporus hartigii and Flammula adiposa. Hartig and Somerville, Diseases of Trees (Engl. Ed. ), p. 17, figs. Peridermium cerebrum, Peck.
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