Archive image from page 449 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark02dans Year: 1913-1981 Fig. 1. A. The part of the pollen-mass of Asclepias incarnata, in which the fissure is formed, shortly after the pollen-mass being put into water. B. Pollen-mass of Asclepias cornuti with its fissure. Here, as in the following Figs., the walls between the grains of pollen have been left out. must be taken to be a bursting of the outer walls of the grains of pollen that form the projection. After the bursting, the pollen-tubes of these grains grow out through the chink
Archive image from page 449 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark02dans Year: 1913-1981 Fig. 1. A. The part of the pollen-mass of Asclepias incarnata, in which the fissure is formed, shortly after the pollen-mass being put into water. B. Pollen-mass of Asclepias cornuti with its fissure. Here, as in the following Figs., the walls between the grains of pollen have been left out. must be taken to be a bursting of the outer walls of the grains of pollen that form the projection. After the bursting, the pollen-tubes of these grains grow out through the chink thus formed. During the germination, the inner grains of the pollen-mass gradually detach themselves from one another, so that all the grains of the pollen- mass may send their pollen-tubes out through the chink. The chinks being formed by bursting is already seen by the fact that its edges are quite keen (vid. Fig. 1), and further it is seen quite clearly in the closely related species, Asclepias incarnata; for in this species the chink is formed so to speak instantaneously on the pollen-mass being put into water. At the same time it is quite
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Keywords: 1910, 1913-1981, archive, book, bookauthor, bookdecade, bookpublisher, booksubject, bookyear, dansk_botanisk_forening, drawing, historical, history, illustration, image, kbenhavn_dansk_botanisk_forening, page, picture, plants, plants_denmark, print, reference, vintage
