. Dedication papers : scientific papers presented at the dedication of the laboratory building and plant houses, April 19-21, 1917. he mycelium is composed of a branching systemof very coarse hyphal threads. These hyphae measure from 5 to 7 juin diameter. In my own work on various rusts, I had never beforemet with such a coarse mycelium. Pole Evans,^ however, has calledattention to the fact that the mycelial threads of Puccinia glumarumreach the relatively enormous size of 10 to 19^1 in diameter; alsoDodge in his paper in this Memoir^ has noted that Farlow^ andWornle^ have found the hyphae in
. Dedication papers : scientific papers presented at the dedication of the laboratory building and plant houses, April 19-21, 1917. he mycelium is composed of a branching systemof very coarse hyphal threads. These hyphae measure from 5 to 7 juin diameter. In my own work on various rusts, I had never beforemet with such a coarse mycelium. Pole Evans,^ however, has calledattention to the fact that the mycelial threads of Puccinia glumarumreach the relatively enormous size of 10 to 19^1 in diameter; alsoDodge in his paper in this Memoir^ has noted that Farlow^ andWornle^ have found the hyphae in Gymnosporangium Ellisii to beexceptionally large, being, according to the latter author, about 8 nin diameter. ^ The cereal rusts. I. The development of their uredo mycelia. Annals ofBotany 21: 441-446. 1907. ^ L. c, p. 1218. L. c, p. 451. * See p. 128. ^ The gymnosporangia of the United States. Ann. Mem. Boston Soc. 1880: 1-38. ^^ Anatomische Untersuchung der durch Gymnosporangium-Arten hervor-gerufenen Missbildungen. Forst. Nat. Zeits. 3: 68-84; 129-172. 1894. Brooklyn Botanic Garden Memoirs. Volume I, Plate VIII,. 9 10 11 Olive: Cytological Structure of Botryorhiza OLIVE: STRUCTURE OF BOTRYORHIZA HIPPOCRATEAE 341 EXPLANATION OF PLATE VIII AH drawings have been made with the camera lucida, and with various combina-tions of Zeiss apochromatic lenses. Except where otherwise noted, the magnificationhas been i,ooo diameters. Botryorhiza Hippocraleae Whetzel & Olive Fig. I. Two young sori, showing the hymenial layer, composed of binucleatecells, and method of spore formation. At the right a young sorus pushing through astoma. Somewhat diagrammatic. X 500. Fig. 2. Branching hypha, showing the binucleate cells, whose walls in someplaces show peculiar thickenings. X 500. Fig. 3. Young haustorium, containing 4 nuclei. Note the invagination of thehost cytoplasm. Fig. 4. Another haustorium, pushing into a mass of dense, granular hostprotoplasm. Fig. 5. A fully mature haustoriu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1918
