中国特有裸子植物的解剖，II．秃杉

台湾杉属Taiwania包括秃杉T．flousiana Gaussen和台湾杉T.cryptomerioides Hayata 两种。秃杉现已列为我国一级国家重点保护植物。本文作者在光学显微镜和扫描电镜下，系统    观察了秃杉营养苗端，叶角质层内、外表面及叶子内部结构，幼茎，茎的次生韧皮部和次生木质 部的结构等。通过对秃杉各营养器官形态结构的观察，并结合有关文献资料，同杉科其它各属作了比较分析，我们不赞同将台湾杉属提升为一个单型科——台湾杉科的主张，而支持Hayata (1906；1907)早期提出的关于台湾杉属应作为杉科中的一个属，其系统位置可介于密叶杉属与杉木属之间的观点。

Anatomy of Gymnosperms Endemic to China, II. Taiwania flousiana Gaussen (Taxodiaceae)

Taiwania Hayata contains two species: T.flousiana Gaussen and T. cryptomerioides Hayata, both endemic to China.        T. flousiana was investigated with both light and scanning electron microscopes in respect to shoot apex, external and internal surfaces of leaf cuticle, primary leaf, juvenal and mature leaves, young stem, secondary phloem and wood of stem, etc,        It is shown that the shoot apex consists of the following five regions: (1) the apical initials; (2) the protoderm, (3) the subapical moher cells;. (4) the peripheral meristem, and (5) the pith mother cells.  The periclinal and anticlinal division of the apical initials takes place with approximately equal frequency.       The juvenal leaf is nearly triangular or crescent-shaped in cross section and belongs tothe leaf type II.  The mature leaf is quadrangular in cross section (the leaf type I).  There are a progressive series of changes in size and shape of the leaf cross section.  The stoma of the ma-ture leaf is amphicyclic and occasionally tricyclic.  The crystals in the juvenal leaf cuticle aremore abundant than those in the mature leaf cuticle.  The transfusion tissue conforms to theCupressus type.   The structure of juvenal leaf is the nearest to that in Cunninghamia unicana-liculata D. Y. Wang et H. L. Liu, while the mature leaf is similar to that of the Cryptomeria.       Sclerenchymatous cells of the hypodermis in the young stem comprise simple layers and arearranged discontinuously.  No primary fibers are found in the primary phloem.  Medullarysheath is present between the primary xylem and the pith.  There are some sclereids in the pith.       The secondary phloem of the stem consists of regularly alternate tangential layers of cellsin such a sequence: sieve cells, phloem parenchyma cells, sieve cells, phloem fibers, sieve cells.The phloem fiber may be divided into thick-walled and thin-walled phloem fiber.  The cry-stals of calcium oxalate in the radial walls of sieve cells are abundant.  Homogeneous phloemrays are uniseriate or partly biseriate, 1-48 (2-13) cells high, and of 26-31 strips per squaremm.       Growth rings of the wood in Taiwania are distinct.  The bordered pits on the radial wallsof early wood tracheids are usually uniseriate, occasionally paired and opposite pitting. Woodparenchyma is present, and its cells contain brown resin substances. Their end walls are smooth,lacking nodular thickenings.  Wood rays are homogeneous. Cross-field pits are cupressoid. Resincanals are absent.      Based on the anatomy of Taiwania and comparison with the other genera of Taxodiaceae,the authors consider the establishment of Taiwaniaceae not reasonable, but rather support theview that the genus is better placed between Cuninghamia and Arthrotaxis in Taxodiaceae.