The Botanical Gazette Volume 14 (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: ambar. This passage is given in explaining a sort of converse to the usual form of lenticels, that is, convex externally. I have been unable to harmonize this statement with the examinations made. In no stems of Acer campestre under three years of age were any lenticels discovered between the wings; in fact, the anatomy given of the first and second year's growth seems to preclude the idea of lenticels forming in this position. If occurring in this place, in any of the stems available for examination, it must have been on stems so far advanced in age as to have lost the peculiar winged appearance. Such stems were not examined. It is still more difficult to understand the meaning of this passage in case of Liquidambar and Euonymus Europaeus. There is here no question about the position of the lenticels. As already explained in the anatomy, the wings of Liquidambar occur, at first, as a single ridge, under a row of lenticels on the upper side of the stem, which afterward splits open along the line of opening of the lenticels, in many cases the break extending quite to the phellogen cells. During this growth there is a large portion of the circumference of the stem not affected by the wing formation; over this are scattered the convex lenticels, which are in no way different from those on stems without cork. None were discovered between the wings in any other sense than this, and there are certainly no exceptions to the usual convex lenticels. In Euonymus Europaeus, the wings are at the corners of the stem, and between them are broad spaces covered with epidermis, which is plentifully supplied with stomata. These soon pass from that stage into that of corky excrescences, which, examined after they are considerably developed, appear to consist of the same tissues as the wing. ...