. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 46 Phytopathology [Vol. 28 zu 1 ^'^-S^-r^^'^^^^^^ - - - 403-400. 1932. '^^ *" "* Peridcrmitim cercbroidcs. Jfyeologia 24: "â """""^^^^i^,^^:^'^^''''"'^ ^^'-^'"â ^ to a ââ¢iâg Pâ,V7.â,u-ââ¢. 7. Klebaiin, ir. ,â.â«y of ,âo .ia,.k Pino. V. S. Pept. Ag,- Bân "â !""%.'')'^i:^âo!ro,*";'^^' -"⢠*" "- ^^".â¢,â¢â Unite., State. Seience ⢠-"^^k^! Seier
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 46 Phytopathology [Vol. 28 zu 1 ^'^-S^-r^^'^^^^^^ - - - 403-400. 1932. '^^ *" "* Peridcrmitim cercbroidcs. Jfyeologia 24: "â """""^^^^i^,^^:^'^^''''"'^ ^^'-^'"â ^ to a ââ¢iâg Pâ,V7.â,u-ââ¢. 7. Klebaiin, ir. ,â.â«y of ,âo .ia,.k Pino. V. S. Pept. Ag,- Bân "â !""%.'')'^i:^âo!ro,*";'^^' -"⢠*" "- ^^".â¢,â¢â Unite., State. Seience ⢠-"^^k^! SeiereT.'.'"!r7l"'.'T03i,'04"^';i3';-'""« "-"^- 'i-- ^or paraffin \ 4 > ^ f '⢠- > > ^ . .u K. PLATE I 1. Trnnsversc section of a nornial twi^ of P. .si/Jrtsiris ;is it ;i|i|it' in early June. Note especially tlie tliickncss of the walls of epidermal and siihepiclcrnial cells at A, the base of the needle fascicle snpjdicd by the bundh" trace at H as ccnitrasted with the thinner walls elsewhere as at C. 2-.'{. Ti'ansverse sections showing unresisted invasions. 2. shows a very limited necrosis at ]ioint of penetration (A), scarcity of liyjdiae in the outei- c(n'tical region as compared with the inn)undle trace at B. o shows a resin canal still open in s])ite of the nl)undance of liypliae near-l»y. The mycelium enters the phloem of the main stele at a. 4. Early stage in the formation of the "collar", Necrosis has sju-(\ad from near the center of infection (a) largely in tlie inner cortex to n and this, together with pronoiHK'co ahMornialities arising in the inner c(»iic.\ and piiincm troni H to c. lias partially isolafi'fl the outer cortex external to it. Following its isolation, it lias liecome severely necrotic from A to i) and ajtjxN'irs to he dying also from I) to K where a harrier from D to r is forming to separate the dying ]tortion from the more normal cort(>x at the left in
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