铃兰的胚胎学研究

铃兰（Ｃｏｎｖａｌｌａｒｉａ ｍａｊａｌｉｓＬ．）的花药四室，药壁发育为单子叶型。腺质绒毡层发育后期出现双核至多核。小孢子四分体主要呈左右对称型，偶见四面体型。胞质分裂为连续型。二细胞型花粉。子房三室，中轴胎座。胚珠倒生，双珠被，厚珠心。珠孔由内珠被形成。胚囊发育为葱型和英地百合型。受精以后，在子房壁、珠柄和外珠被细胞中含有草酸钙针晶。胚发育类似于石竹型，但基细胞发生纵裂形成两个子细胞。核型胚乳；合点端具巨形胚乳核

EMBRYOLOGICAL STUDIES ON CONVALLARIA MAJALIS L.

Embryological studies on Convallaria majalis L. revealed that: 1. The anther was four sporangiate. The development of anther walls conformed to the monocotyledonous type. The tapetum, of which each cell contained two or many nuclei in the later stages, was of glandular type. Meiosis of the microspore mother cells was accompanied by successive cytokinesis, which resulted in the formation of isobilateral and tetrahedral tetrads. The mature pollen grains were of the 2 celled type. 2. The ovary was trilocular. The placentation was axile,but placentas were not fully fused in the center of the ovary. The ovule was bitegminous, crassinucellate and anatropous. The micropyle was formed by the inner integument. 3. The development of the embryo sac was of the Allium type and Endymion type. 4. Raphides were observed in the ovary wall, the funiculus and the outer integument after fertilization. 5. The development of the embryo was similar to the Caryophyllad type, but the basal cell was vertically divided into two cells. 6. The development of the endosperm was of the nuclear type. However, the gigantic endosperm nucleus was formed at the chalazal end.