摘要
银杏叶脉间有明显的连汇现象,而且连汇方式多样;叶脉外有1-3个大型分泌细胞;树脂道灰白色并在二叉脉间成不连续的条状分布长0.5—10mm,宽0.5—1mm。为了便于读者更好地理解裸子植物类群间的演化关系,在对银杏叶片描述时应附加以下内容”…开放二歧脉序,稀有连汇,自叶柄至叶缘在二歧脉间有不连续的纵行条状灰白色树脂道;”银杏叶中的树脂道可经透明后从叶肉中取出,故可作为植物学中观察树脂道的好材料。
The anastomoses of the venation in Ginkgo biloba L.are definite but petterns are diversi-fied;There are 1-3 large secretory cells around the vascul ar bundles in the leaves;slender,grey anddiscontinuous resin ducts go between the vein branches regularly with length and width of 0.5-10mm and0.5-1mm respectivcly:“…venation,open dichotomy with anastomoses scarcely;resin ducts,long or short,grey and discontinous,go between vein branches”should be added to the descriptions of Ginkgo leaves,which will be helpful for making readers understand better the phylogeny of Gymnospermae.
出处
《河南师范大学学报（自然科学版）》
CAS
CSCD
1992年第4期95-98,共4页
Journal of Henan Normal University(Natural Science Edition)
关键词
银杏
连汇
树脂道
叶脉
Ginkgo biloba
resin ducts
venation anastomose
