Botanical Gazette, Volume 25John Merle Coulter, M.S. Coulter, Charles Reid Barnes, Joseph Charles Arthur University of Chicago Press, 1898 Publishes research in all areas of the plant sciences. |
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Page 74
... MICROSPORES . In the young sporangium a plate of hypodermal cells becomes distinctly differentiated by means of their enlarging radial diameter and prominent nuclei ( fig . 1 ) . There is great confusion in ter- minology in reference to ...
... MICROSPORES . In the young sporangium a plate of hypodermal cells becomes distinctly differentiated by means of their enlarging radial diameter and prominent nuclei ( fig . 1 ) . There is great confusion in ter- minology in reference to ...
Page 76
... microspores the usual sequence of events was observed , an ordinary series being shown in figs . 7- The four spores may be arranged in the usual tetrahedral fashion ( fig . 11 ) , or may lie in the same plane ( fig . 12 ) . In both ...
... microspores the usual sequence of events was observed , an ordinary series being shown in figs . 7- The four spores may be arranged in the usual tetrahedral fashion ( fig . 11 ) , or may lie in the same plane ( fig . 12 ) . In both ...
Page 86
... microspore tetrad in R. septentrionalis . FIG . 12. Second nuclear division in pollen mother cell , occurring in same ... microspores of R. septentrionalis , showing the two nuclei . FIGS . 18-20 . Macrosporangium of R. septentrionalis ...
... microspore tetrad in R. septentrionalis . FIG . 12. Second nuclear division in pollen mother cell , occurring in same ... microspores of R. septentrionalis , showing the two nuclei . FIGS . 18-20 . Macrosporangium of R. septentrionalis ...
Page 125
... microspores and macro- spores had nearly reached their full size , but were still uninucleate , ger- mination under natural conditions not beginning until the next spring . SELAGINELLA APUS Spring . The development is carried further ...
... microspores and macro- spores had nearly reached their full size , but were still uninucleate , ger- mination under natural conditions not beginning until the next spring . SELAGINELLA APUS Spring . The development is carried further ...
Page 139
... microspores and macro- spores , and sixteen again in the oospore . - J . M. C. DAVID M. MOTTIER has recently published a paper on the behavior of the nuclei in the development of the embryo sac and the phenomena of fer- tilization . The ...
... microspores and macro- spores , and sixteen again in the oospore . - J . M. C. DAVID M. MOTTIER has recently published a paper on the behavior of the nuclei in the development of the embryo sac and the phenomena of fer- tilization . The ...
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Common terms and phrases
anthers Anthoceros antipodals apex apical appearance archegone archesporial cell basal wall black rust BOTANICAL GAZETTE botanists bracts branches calyx Capriola carpels centrosomes characters collected color corolla cytoplasm diameter dicotyledons disease division Eichhornia embryo sac embryogeny endosperm epibasal hemisphere filaments flora flowers forest formation freq fruit fungi genera genus Geyser Basin glabrous grass growth herbarium inflorescence insects involucral later layer leaves lobes lodicules mature megaspore microsporangia microspores monocotyledons morphological multifidus nucellus nucleus nutation observed occur organs origin ovary ovule Panicum paper petioles physiology plants PLATE pollen tube polyembryony Polygonum ramosissimum position prairie primary sporogenous cell Professor prothallium protoplasm pubescent Pyrola regarded region root seed segmentation species specimens spindle sporangia spores sporophyte stage stamens stem structure subseries surface synergids tapetal cells tapetum thallus tion tissue trichomes usually vegetative Yellowstone National Park
Popular passages
Page 379 - A Report to Congress on Agriculture in Alaska, including Reports by Walter H. Evans, Benton Killin, and Sheldon Jackson.
Page 117 - Rafflesiacea:, rather than with parasitic members of the Scrophulariacea. The seedling parasite seemed early to attack young oak roots, and steadily grew for ten to twelve years until a huge mass six inches across might be formed. This mass was characterized chiefly by the abundance of sclerenchyma patches developed by the oak host through the irritant action of the invading parasite. The presence of stomata on the stem and their absence on the scale leaves was pointed out, while the double circle...
Page 37 - ... advances in the knowledge of plants, and especially of the relations of parasitic fungi to higher plants. Eriksson points out " that they provide a new explanation for the varying susceptibility of different varieties of cereals, and also that we are warranted in suggesting that the predisposition of Hosford wheat to yellow rust may be explained by assuming that between this variety of wheat and the yellow rust an extremely vital mycoplasmasymbiosis is to be found, while, on the contrary, the...
Page 37 - ... the parent. For the last four years he has therefore been growing plants in sterilized earth in glass houses specially constructed to keep out the spores of the disease which may be floating in the air. He reaches the general conclusions : A. The outbreak of grain rust is due (a) in the first place to germs of disease in the host plant itself, which in certain cases are inherited from the parent plant through the seed, and in which they lead a latent symbiotic life as a mycoplasma and continue...
Page 382 - Gazette, the coming meeting of the American Association for the Advancement of Science at Boston promises to be one of the most notable in the history of the Association. It is the fiftieth anniversary, and special efforts are being made to arrange a worthy celebration. The local committees have been appointed, and the week selected is August 22-27. The local secretary is Prof. HW Tyler, of the Massachusetts Institute of Technology. PROF. JOHN W.
Page 163 - Zamia as proof of the existence of centrosomes in seed plants. He says: Even though all earlier observations upon the presence of attractive spheres and centrosomes in different Cormophytes may be regarded as inexact, one can not doubt that the bodies recently described and figured by Webber in the pollen cells of Zamia * * * are centrosomes (48, p. 161).