Recent Anatomical Papers

Theo. Holm
1907 Botanical Gazette  
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more » ... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. 1907] CURRENT LITERATURE 153 NOTES FOR STUDENTS Recent anatomical papers.-A very detailed account of the leaf structure of American Lauraceae has been given by PETZOLD,5 his purpose having been to establish at least generic anatomical characters. The leaf structure, however, proves to be quite uniform, and generic distinctions are not feasible. For example, a concentric structure is characteristic of Silvia, but occurs also in a few species of Phoebe and Nectandra; a hypoderm is developed in Cryptocarya and Hufelandia, but also in some species of Ocotea, Persea, and other genera; a closed sheath of stereome surrounds the veins constantly in some genera, but not in others; crystals of calcium oxalate, otherwise so frequent in this family, do not occur in Lindera and Dicypellium, but they are also absent in several species of other genera. The paper is a welcome contribution to the knowledge of the anatomy of these plants, even if no generic characterization seems possible. The structure of leaves, seeds, and pollen of Polemoniaceae have been examined by HtLLER,6 his material including a large number of American species. It deserves mention that calcium oxalate was detected in certain species of Collomia and Gilia as single crystals, and as druids in the monotypic Bonplandia. The stomata were always observed to lack subsidiary cells, thus agreeing with the type of Ranunculaceae. Trichomes as covering-hairs and as glandular hairs are very common, representing several characteristic forms. In the midrib of Phlox Drummondii and various species of Gilia, the mestome strand contains two or sometimes several groups of leptome. In regard to the structure of the seed coat, Phlox is the only genus in which the epidermis contains mucilage only in the outer wall beneath the cuticle. The peculiar spirals of cellulose were noticed in most species of all genera except Phlox. Inside the epidermis there are usually some strata of compressed tissue and a pigment layer; but in Cobaea a fourth tissue was absent, namely, woody parenchyma beneath the epidermis. The nutritive tissue, which is relatively sparingly developed, contains oil and aleurone. The pollen grains are globose or elliptic, and the exine is never smooth, but covered with protuberances in the shape of ridges or granules in numberless variations. There are always more than three germ-pores, from four to many, and in some cases scattered irregularly over the surface. Although the author had to depend upon dried specimens, the results are nevertheless quite interesting and of importance to systematic anatomy. However, a study of fresh material, including the stem and root, would be highly desirable. Forty-three species of Meliosma (Sabiaceae) have been examined by DIHM.7 The palisade tissue is very characteristic in representing a modification 5 PETZOLD, V., Systematisch-anatomische Untersuchungen uiber die Laubblatter der amerikanischen Lauraceen. Bot. Jahrb. 38:445-474. I907. 6 HULLER, G., Beitrage zur vergleichenden Anatomie der Polemoniaceen. Beih. Bot. Centralbl. 2II:I73-244. PI. 8. figs. 25. I907. 7 DIEM, H., Das Blatt der Gattung Meliosma in anatomischer Hinsicht. Beih. Bot. Centralbl. 2II:II7-147. pIs. 5-6. figs. 2I. I907.
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