…Compared to the closely related Pinaceae, the cones are smaller, the seed scales and the bract scales are fused, the pollen does not have two prothallial cells like the Pinaceae, and it lacks an air sac, making it a more evolved structure than the Pinaceae. The intermediate type between the Pinaceae and the Sciadopitys is the Sciadopitys , and the Sciadopitys family is sometimes created. The Cryptomeria japonica family is sometimes treated as a subfamily of the Cupressaceae family, as it has no distinction from the Cupressaceae family except for the phylloduction. … *Some of the terminology explanations that mention "Sciadopitys" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…近縁のマツ科と比較すると,球果はマツ科より小型で,種鱗と包鱗が合着しており,花粉にマツ科のような2個の前葉体細胞がつくられず,気囊も欠くなど,マツ科より進化したつくりをもっている。マツ科との中間型を示すのがコウヤマキSciadopitysで,コウヤマキ科を設けることもある。 スギ科はヒノキ科と葉序以外に区別点がなく,ヒノキ科の1亜科として扱われることもある。… ※「Sciadopitys」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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