从木材解剖特征初拟针叶树分类系统

<正> 针叶树(Conifers)包括银杏纲和松杉纲的树种。根据《中国植物志》第七卷记载,现代裸子植物的种类分属于4纲9目12科71属约800种,我国产4纲8目11科41属236种,栽培1科7属51种。从国产针叶树材的解剖特征观察,银杏纲木材构造简单,仅具管胞、含晶细胞和射线细胞。管胞排列不整齐,射线薄壁细胞垂直壁无节状加厚,四隅无凹痕,轴向薄壁细胞缺,射线仅单例,所以是针叶村最原始的一个纲,应排列在松杉纲之前。

CLASSIFICATION PROPOSED FOR CONIFERS ACCORDING TO THE ANATOMICAL FEATURES OF THE WOOD

The Conifers of Chnia consist of 2 classes , 6 orders, 8 families and 38 genera. According to the anatomical features of the wood, the author of the p esent paper suggests that the classification for Chinese Conifers may be as follows:Class 2 . Ginkgopsida Order 2 . GinkgoalesFamily 2 . Ginkgoaceac - Ginkgo Class 3 . Coniferopsida Order 3 .AraucarialesFamily 3. Araucariaceae - (1) Araucaria (2) Agathis Order 4 . Podocarpales Family 4 . Podocarpaceae - ( 1 ) Podocarpus ( 2 ) Dacrydium Order 5.CephalotaxalesFamily 5. Cephalotaxaceae - (1) Cephalotaxus (2) Amentotaxus Order 6 . TaxalesFamily 6. Taxaceae - (1) Pseudotaxus (2) Taxus (3) Torreya Order 7 . PinalesFamily 7 . PinaceaeSubfamily Abietoideae - ( 1 ) Abies ( 2 ) Keteleeria ( 3 ) Tsuga(4) Pseudotsuga (5) Cathaya (6) Picea Subfamily Laricoideae - ( 1 ) Larix ( 2 ) Cedrus ( 3 ) PseudolarixSubfamily Pinoideae - Pinus |Family 8 . Taxodiaceae - ( 1 ) Sciadopitys ( 2 ) Cunninghamia( 3 ) Cryptomeria ( 4 ) Glyptostrobus(5) Sequoiodendron (6) Sequoia (7) Taxodium (8) Metasequoia( 9 ) Taiwania Family 9 . CupressaceaeSubfamily Thujoideae - ( 1 ) Thujopsis ( 2 ) Thuja ( 3 ) Platycladus( 4 ) Calocedrus Subfamily Cupressoideae - (1) Cupressus (2) Chamaecyparis( 3 ) Fokienia Subfamily Juniperoideae - ( 1 ) Sabina ( 2 ) Juniperus