. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 0- .C. Fig. 4. A. Portion of transverse section of resistant stem of Pinus sylvestris one month after inoculation, a. Phellogen below necrotic area showing stimulation. B. Portion of cortical region of susceptible liost directly beneath epidermis. The granular cells at the left are those first attacked by the fungus after penetration. These cells con- tain much tannin. Note stunted haustoria in cells a and b. x 300. C. Diagram of transverse section of resistant stem three months after inoculation, a. Necrotic area in corte
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 0- .C. Fig. 4. A. Portion of transverse section of resistant stem of Pinus sylvestris one month after inoculation, a. Phellogen below necrotic area showing stimulation. B. Portion of cortical region of susceptible liost directly beneath epidermis. The granular cells at the left are those first attacked by the fungus after penetration. These cells con- tain much tannin. Note stunted haustoria in cells a and b. x 300. C. Diagram of transverse section of resistant stem three months after inoculation, a. Necrotic area in cortex and phloem where cells have died following fungus invasion, b. Pseudo-annual ring formed by inhibited cambium derivatives, c. Region of tangentially elongated tracheids, bending of rays, and excessive formation of secondary rays, x 35. 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. ]
Size: 1646px × 1518px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookpublisherphiladelphiasn, booksubjectbotany
