File:Contributions from the Botanical Laboratory, vol. 5 (1892) (20499493350).jpg

Title: Contributions from the Botanical Laboratory, vol. 5
Identifier: contributionsfro05unix (find matches)
Year: 1892 (1890s)
Authors: University of Pennsylvania. Botanical Laboratory
Subjects: Botany; Botany
Publisher: Philadelphia : University of Pennsylvania Press
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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70 Henderson—Comparative Study of Pyrolaceae and papillate hairs appear on transverse section. Internal to the epfdermis are two to three layers of thick-walled, then two to three layers of thin-walled, cells forming the conex The outer 3-4 layers of the phloem are heavily ligmfied forming an area equal in width to the succeeding area of thin-wal ed phloem There is only one year's wood developed but this .s rather large in amount (Fig. 5. i), the entire area bemg one and a hal times in width that of soft and hard bast together. Internal to the wood is a rather large area of pith composed of thin- walled rounded cells with small intercellular spaces. In C. macuUita the epidermal papillae appear more numerous and more strongly developed than in C. umbellata. There is an outer thick-walled area of three layers and an mner thm- walled area of 3-4 layers of cortex. There are four layers of thick-walled hard bast which is slightly greater m width than the soft bast. The wood is not as strongly developed as in C. umbellata, the width being equal to that of the soft and hard bast combined. The pith is similar to that of C. urn- " In P. rolundifolia the epidermis is not papillate. There are two layers of thick-walled, three of thin-walled, cortical cells. The hard bast is five layers in thickness, being much greater in width than that of the soft bast. The wood is developed about as much as in C. maculata, being equal in amount to the width of the hard and soft bast together. In P. elliptica the appearance of the section is very similar to that of P. rolundifolia. In Moneses uniflora the epidermis is not papillate. All the cortical layers (5-6) are thin-walled. There are four to five layers of hard bast that dip in slightly between the patches of soft bast so that the latter does not form a continuous ring as in all the preceding. Each patch consists only of a few small thin-walled cells. Internal to these is a rmg o wood that is very poorly developed in comparison with all those preceding. In width it is only slightly greater than that of the soft bast patches. In Monotropa hypopitys the axis becomes more fleshy and wider in diameter than in any of the preceding. There are papillate hairs present that are more numerous and much longer than in Chimaphila. Internal to the epidermis are about twenty Monotropaceae with Reference to Ericaceae 71 * JC
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HB Fig. 6. T. S. ascending axis Pterospora andromedea X 200.

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