山茶科核果茶属、石笔木属和拟核果茶属的分类学位置

从形态学、胚胎学、孢粉学和解剖学４方面探讨了核果茶属（ＰｙｒｅｎａｒｉａＢｌ．）、石笔木属（ＴｕｌｃｈｅｒｉａＤｕｎｎ）和拟核果茶属（ＰａｒａｐｙｒｅｎａｒｉａＨ．Ｔ．Ｃｈａｎｇ）的分类学问题，３属在形态上的主要差异具有连续性而难以断开，大小孢子和雌雄配子体的发生过程高度相似，均具有皱波状至皱网状的花粉外壁纹饰和大头茶型（Ｇｏｒｄｏｎｉａｅｅｏｕｓ－Ｔｙｐｅ）气孔器，几方面的资料提示，核果茶属、石笔术属和拟核果茶属是一个不可分割的自然类群，从而以新的证据支持或主张将上述３属合并成１属。

STUDIES ON TEH SYSTEMATIC POSITION OF GENERA PYRENARIA, TUTCHERIA AND PARAPYRENARIA OF FAMILY THEACEAE

The systematic positions of these three genera Pyrenaria,Tutcheria and Parapvrenaria have been studied in this paper based on these data of mopohology, embryology,palynology and anatomy. Morphologically,these main characters pfoposcd by former researcbers to differentiate these three genera from one another,such as the number of ovules each locule and the texture of capoodermis,tc,are continually variable so that it is difficult to distinguish them clearly,The high similarity in the shape,structure and geimination type of their seed binds them closely to-gether.Four speciees of Pyrenaria and Tutcheria have been investigated in embryology. The mega-microsporogenesis and mega-microgametogenesis in all four species show no differenee.The similarity in embryilogy betwcen genera Pyrenaria and Tutcheria is higher than that between species in genus Camellia which is close to these three genera.The pollens of five species of these three genera have been observed,so have the stomatal type of fifteen species representing these three genera. Except shape and size, palynological fea-tures of the five species are very identical,and the aperture of 3-colporate and the exine sculpture of rugulate-undulate to rugulate-reticulate are shared by these species.The stomata of all fifteen spccies examined are of Gordoniaceous-Type. In view of the above-mentioned facts,it can be concludCdthat these three genera should be anatural group which cannot be separated and,Tutcheria and Parapvrenaria should be redueed to synonyms of Pyrenaria.It is possible that Pyrenaria is a sister group of Camlliaand is more primitive in systematic evolution than the latter.