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油松(Pinus tabulaeformis Carr.)隶属裸子植物、松科(Pinaceae),正常情况下孢子叶球为单性,雌雄同株。在栽培区偶尔出现两性孢子叶球等畸形现象。作者2003年在内蒙古包头市发现了两性孢子叶球,于是对其作了调查、进行了解剖观察。本文仅将解剖观察结果做一报道:油松两性孢子叶球的轴上半段螺旋着生正常大孢子叶,轴下半段螺旋着生正常小孢子叶,而大、小孢子叶段之间为过渡段;过渡段的若干枚小孢子叶腋内着生发育程度不同的珠鳞,这些珠鳞上可以着生大孢子囊(胚珠),也可以着生与胚珠很相似的(有珠心和珠被)小孢子囊(花粉囊),过渡区的小孢子叶远轴面着生的小孢子囊大多会产生发育程度不同的珠被状结构。作者认为这些畸形现象提示:大孢子囊与小孢子囊是同源的,反映了二者相互转变的过程。
Pinus tabulaeformis Carr. Belongs to the gymnosperms and Pinaceae. Under normal conditions, the spheroplasts are monomorphic and monoecious. Occasionally there are abnormalities such as amphotropic spherules in the cultivation area. The author in 2003 found in Inner Mongolia Baotou City amphotropic spore leaf ball, so he made a survey, conducted an anatomical observation. This article only anatomical observations made a report: Pine needle amphotropic spheroplast axis of the spire of the normal megaspore leaves, the next half of the axis of the spiral sprout of normal microspore leaves, and large, microspore leaf segments For the transitional section of the transitional section of the microspores axillary axillary axillary development of different scales, these beads can be spawned as a large sporangia (ovules), but also can be born and ovules are very similar (with beads and beads Was microspore sac (pollen sac), the transitional microsporophyte distal microsporaminal surface of the microsporophytes will produce mostly different degree of beaded-like structure. The author believes that these deformities suggest that the megaspores and hysterosols are homologous, reflecting the process of mutual transformation between the two.