. The botanical magazine = Shokubutsugaku zasshi. Plants; Botany. 186 THE BOTANICAL MAGAZINE. [Voi. xxiv. No. mesozoica, sp. no v. Longitudinal section of aleafy twig, p, pith ? X. ph, xylem and phloem of the axis ? st, stone cell?v, vascular strand of the leaf ? it, transfusion tissue ? JRC, central ?arge resin canal?rc?lateral small resin canal?f? fructifica- tion of fungus {Pleosporites gen. nov )?XlO. the autumn wood and Pith. Pith consists of parenchy- matous thin walled cells and roun- dish stone cells. In the pith of the younger twig, small intercellular spaces
. The botanical magazine = Shokubutsugaku zasshi. Plants; Botany. 186 THE BOTANICAL MAGAZINE. [Voi. xxiv. No. mesozoica, sp. no v. Longitudinal section of aleafy twig, p, pith ? X. ph, xylem and phloem of the axis ? st, stone cell?v, vascular strand of the leaf ? it, transfusion tissue ? JRC, central ?arge resin canal?rc?lateral small resin canal?f? fructifica- tion of fungus {Pleosporites gen. nov )?XlO. the autumn wood and Pith. Pith consists of parenchy- matous thin walled cells and roun- dish stone cells. In the pith of the younger twig, small intercellular spaces are found ? but in that of the larger axis, the cells are packed closely and leave no intercellular spaces. We see frequently fungal hyphae in the parenchymatous cells. The structure of the pith closely resembles that of Cryptomeriopsis antiqua (Stopes and Fujii 11). Protoxyletn. The elements of the protoxylem have spiral thickenings and are placed innermost to the primary xylem in a number of groups, so that the wood is endarcJi. Secondary Wood, In this portion, the absence of resin canals is one of the characteristics. The annual rings are not always to be made out dis- tinctly. It is due to the two conaitions, firstly that the development of the autumn wood is not enough pronounc- ed, secondly that the development of the "Rotholz" elements (Hartig 2) begins in spring often immediately as the continuation of the autumn wood of the preceding ?year and gradually passes into the summer wood. There are two kinds of tracheids namely thin walled and thick walled ones. In transverse section the former are an- gular, forming lighter coloured normal spring and summer wood, and the latter are roundish, forming chiefly the " ; On the radial walls,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
