Image d'archive à partir de la page 370 de Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Année : 1913-1981 F. Børgesen : Rhodopliyceae des Indes Occidentales danoises W.. 363 Le tetrasporangia, et des anthéridies sont trouvés sur cystocarpes usines distinctes. Le tetrasporangia sont développés dans les tissus périphériques. La belle-mère de cellules grossissent, les sporanges remplis de proto- plasma et d'obtenir une couleur rouge foncé. Zonately Ils sont divisés. L'anthéridie se produisent tous les stands- où à la sur- face de la plantes mâles formant de petites ou larg- er des groupes. Le procarps carpogonial et b

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Archive image from page 370 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 F. Børgesen: Rhodopliyceæ of the Danish W. Indies. 363 The tetrasporangia, antheridia and cystocarps are found upon separate plants. The tetrasporangia are developed in the peripheral tissue. The mother-cells of the sporangia become enlarged, filled with proto- plasma and getting a dark red colour. They are zonately divided. The antheridial stands occur every- where upon the sur- face of the male plants forming smaller or larg- er groups. The procarps and carpogonial branches are formed on the inner side of the peripheral tis- sue facing the cavity in the thallus. We will therefore begin to ex- amine a section of this tissue from the summit of a female plant. Fig. 356 shows a part of such a section; the in- nerside of it, which is facing the cavity of the thallus, is turned up- wards. To make the organs of reproduction more clearly visible I have coloured the tissue in hæmatoxylin. In the middle of the figure we find a short branch composed of rather robust cells. It originates from one of the filaments found on the innerside of the peripheral tissue, whose large cells are seen underneath. This branch consists at first of a smaller oblong cell, then follows a larger one having in this case an outgrowth on the left side. The next cell is especially coloured by the hæmatoxylin and filled to a great extent with granular cell contents; it has also a thicker wall than the other cells of the branch. This cell is the auxiliary cell. It always bears three cells. In the figure two of them only are visible, the third one is lying underneath the auxiliary cell. Fig. 356. Agardhiella tenera (J. Ag.) Schmitz. Part of the tissue seen from the innerside with auxiliarv-cell branch and carpogonial branches. (About 250:1).

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