Anatomical characteristics on the leaves of following nineteen species, belonging to the Sect. Mitratae and other sections, are treated in this paper. Carex Fernaldiana LÉVEILLÉ et VANIOT, C. meridiana AKIYAMA, C. sabynensis LESSING, C. Mayebarana OHWI, C. formosensis LÉV. et VAN., C. tenuinervis OHWI, C. nervata FRANCHET et SAVATIER, C. alterniflora FRANCHET, C. pudica HONDA, C. atroviridis OHWI, C. hachijoensis AKIYAMA, C. angustisquama FRANCH., C. pseudo-sadoensis AKIY., C. podogyna FRANCH., C. scitaeformis KÜKENTHAL., C. misandra R. BROWN, C. sub-transversa C. B. CLARKE, C. Arnelli CHRIST and C. capricornis MEINSHAUSEN.
1. The male and female gametes, the fertilization and the embryogeny of Keteleeria Davidiana BEISSNER var. formosana HAYATA are described. 2. In general the proembryogeny of Keteleeria agrees with those of the other members of Abietaceae and Pinaceae, 3. In the post-embryogeny cleavage polyembryony occurs in three different ways, namely the first by the cleavage of the primary embryo, the second by the embryonal development of the suspensor cells and the third by the embryonal development of the rosette cells. 4. In the primary embryogeny of Keteleeria the cleavage of the embryo takes place in the later stage of the formation of the secondary suspensor. 5. The chromosome number of Keteleeria is twelve in the haploid generation.