Notes on the Anatomy of Peridermium Galls. I

• Published in: American journal of botany Vol. 3; no. 1; pp. 12 - 23
• Main Author: Stewart, Alban
• Format: Journal Article
• Language: English
• Published: Brooklyn Botanic Garden 01.01.1916
• Subjects: Anatomy; Daughter cells; Fungi; Parenchyma; Pitting; Plant gall; Resin canals; Tracheids; Wood; Wood structure
• ISSN: 0002-9122; 1537-2197
• DOI: 10.2307/2435108

The more important facts presented in this article are briefly summarized below: 1. Both an alternate and an opposite arrangement of bordered pits in the radial walls of the tracheids. 2. An unequal thickening of the walls and luminae of the tracheids. 3. Very short tracheids with blunt end walls, which resemble parenchyma ceils except in the pitting. 4. Cells which are transitional between tracheids and parenchyma cells in the pitting. 5. The presence of true wood parenchyma cells. 6. A small production of thin-walled summer tracheids. 7. A probable absence of bars of Sanio from many of the tracheids. 8. An increase in the number of rays in the gall wood. 9. A tendency towards the production of multiseriate rays. 10. Ray tracheids which are transitional between those of both hard and soft pines. 11. The presence of a balled or whorled arrangement of tracheids in tangential section. 12. A great increase in the number of resin canals in the gall wood but no such increase in the uninfected wood close by. The examination of this gall has revealed so many points of anatomical interest that a further study of this subject seems to be worth while. On this account the author expects from time to time to issue other papers on the anatomy of Peridermium galls on pines and other conifers.