. Comparative morphology of Fungi. Fungi. Fig. 371.—1. Gymnosporangium clavariaeforme. Section of a pycnium on leaf of Crataegus ( X 345). 2. Phragmidium violaceum. Pycnium on Rubus with ruptured cuticle (X440). 3. Cronartium ribicola portion of pycnium (X 1,160). P, paraphyses; Ep, epidermis; C, cuticle. (After Blackman, 1904, and Colley, 1918.) by a septum and which then falls off. The other remains behind in the basal cell and divides repeatedly, forming many successive spores. The periphery of the whole sorus is surrounded by a ring of periphyses (in systematic works often called paraphyse
. Comparative morphology of Fungi. Fungi. Fig. 371.—1. Gymnosporangium clavariaeforme. Section of a pycnium on leaf of Crataegus ( X 345). 2. Phragmidium violaceum. Pycnium on Rubus with ruptured cuticle (X440). 3. Cronartium ribicola portion of pycnium (X 1,160). P, paraphyses; Ep, epidermis; C, cuticle. (After Blackman, 1904, and Colley, 1918.) by a septum and which then falls off. The other remains behind in the basal cell and divides repeatedly, forming many successive spores. The periphery of the whole sorus is surrounded by a ring of periphyses (in systematic works often called paraphyses) which have arisen by the elongation of the outer cells of the stroma. They intertwine in a dome over the fertile tissue and later by their pressure, rupture the epidermis. In the primitive Pucciniastreae, the periphyses are absent, the cuticle or epidermis of the host being the only covering of the sorus. At first this is often penetrated by a small pore through which the pycnospores (spermatia) are extruded, Later the whole cuticle or epidermis may. 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 Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 1895-. New York [etc. ] McGraw-Hill Book Company, Inc.
Size: 980px × 2550px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishern, booksubjectfungi
