. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 4 â i- ⦠1938] True: Gall Development ox Pixrs Sylvesthis 29. Fig. 2. A. An invasion resisted partially by cell hypertrophy as at a. B. An inva- sion spreading vertically along the resin canal (a) has stimulated the adjacent tissues to cell division and radial cell orientation accompanied by marked reduction of intercellular space. C. An invasion being effectively walled out by a cicatrizing zone. D. Radial longitudinal section of infected phloem and xylem. Note b
. Contributions from the Botanical Laboratory and the Morris Arboretum of the University of Pennsylvania, vol. 14. Botany; Botany. 4 â i- ⦠1938] True: Gall Development ox Pixrs Sylvesthis 29. Fig. 2. A. An invasion resisted partially by cell hypertrophy as at a. B. An inva- sion spreading vertically along the resin canal (a) has stimulated the adjacent tissues to cell division and radial cell orientation accompanied by marked reduction of intercellular space. C. An invasion being effectively walled out by a cicatrizing zone. D. Radial longitudinal section of infected phloem and xylem. Note broad rays with abundant intercellular hyphae (a) ; short, blunt irregularly pitted tracheids (b) ; abundance of phloem parenchjTna (c) ; and resin-containing cavity (d) associated with radial resin canal not shown in this section. E. Transverse section showing wedge-shape area of gall wood with adnormalities intensified at the edge. Note also the internal and exter- nal areas of killing in the cortex. F. Longitudinal section showing a late stage in the development of the '^collar" with living tissues considerably isolated radially by the death of cells interior to them. resistance, others are constantly opposed by partial barriers, and yet others may at once be surrounded by barrier zones and walled out completely. Tn the course of the present study, a shoot no more than 2 cm. long, sectioned serially a month after inoculation, was found to have 24 infections. Five of these showed no trace of recogrnizable mycelium among: the very abnormal INTENTIONAL SECOND EXPOSURE. 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 University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum. Philadelphia : [s. n. ]
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