. Botany for high schools. Botany. Fig. 249. Section through leaf of barberry at point affected with the cluster-cup stage of the wheat rust; spermogonia above, aecidia below. (After Marshall-Ward.) to the wheat (also to the other cereals and some grasses). Here they germinate and the mycelium enters at a stomate and pro- duces the intercellular mycelium. At certain points under the. Fig. 250. Fertilization and development of aecidiospores in a rust, Phragmidium violaceum. ep, epidermis of host. 5/, steriic cells at ends of a-cidial thread, /r, fertile cells. .-1. part of axrictial stroma, sho
. Botany for high schools. Botany. Fig. 249. Section through leaf of barberry at point affected with the cluster-cup stage of the wheat rust; spermogonia above, aecidia below. (After Marshall-Ward.) to the wheat (also to the other cereals and some grasses). Here they germinate and the mycelium enters at a stomate and pro- duces the intercellular mycelium. At certain points under the. Fig. 250. Fertilization and development of aecidiospores in a rust, Phragmidium violaceum. ep, epidermis of host. 5/, steriic cells at ends of a-cidial thread, /r, fertile cells. .-1. part of axrictial stroma, showing two binucleate, fertile cells. B, showing nucleus of sperm cell at base ot lertile cell passing into the fertile cell at the side. C, similar stage. D-G, different stages in formation of aecidiospores. H, mature teciditspore. (After Blackman.) epidermis of the leaf, or stem, a group of short spore-bearing hyphae are formed, each of which bears a broadly elliptical spore with minute warts on the wall, and with a yellowish oil in the proto- plasm. These spores are the nredospores. The pustule formed. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
