. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 80 American Fern Journal longed. It is hoped, however, that this paper will be of interest to students of the ferns, and will stimulate further work to test the correctness of the views herein expressed. In conclusion, the writer wishes to extend his sincere thanks to Dr. J. M. Fogg, with whose help the work on spores was carried out, and to Dr. E. T. Wherry, who made many helpful suggestions during the course of the work. Literature Cited 1877-80. Eaton, D. C. **The Ferns of North ; 2 vol. Boston. 1896. Weave
. Contributions from the Botanical Laboratory, vol. 12. Botany; Botany. 80 American Fern Journal longed. It is hoped, however, that this paper will be of interest to students of the ferns, and will stimulate further work to test the correctness of the views herein expressed. In conclusion, the writer wishes to extend his sincere thanks to Dr. J. M. Fogg, with whose help the work on spores was carried out, and to Dr. E. T. Wherry, who made many helpful suggestions during the course of the work. Literature Cited 1877-80. Eaton, D. C. **The Ferns of North ; 2 vol. Boston. 1896. Weaver, C. B. Proc. la. Acad. Sci. 3: 159-161. 1902. Engler and Prantl. * * Die NatUrlichen Pflanzenf amilien.'' Leipzig. a. Sadebeck, R. (Pteridophyta in general) p. 15. b. DiELS, L. (Polypodiaceae) pp. 139-339. (Aspidieae, p. 166). c. Bitter, G. (Ophioglossaceae) pp. 470-472. 1905-06. Christensen, Carl. ** Index ; 1914. Pickett, F. L. *'A peculiar form of Pellaea atropurpurea Link.'' Fern Journ. 4: 97-101. 1914. 1917. Pickett, F. L. **Is Pellaea glabella Mett. a Distinct Species?" Fern Journ. 7: 3-5. 1917. 1917a. Butters, F. K. '*Pellaea atropurpurea (L.) Link and Pellaea glabella Mett. ex ; Fern Journ. 7: 77- 87. 1917. 1917b. Butters, F. K. (Studies in Athyrium). Rhodora 19: 169-207. Oct. 11, 1917. 1919. Christensen, Carl. **A Monograph of the Genus Dryop- teris.'' Part II. Explanation op Plates The outlines of the figures were made in all cases with the aid of a camera lucida; artificial light was used, with a compound micro- scope equipped with a jflO eyepiece and a 4 mm. objective. The spores were mounted in water. The figures are enlarged approxi- mately 425 times. Plate 5. Fig. 1. Ophioglossum vulgatum L.; Fig. 2. Botry- chium angustisegmentum (P. & M.) Fern.; Fig. 3. B, matri- U- . r-^' 1 ¥?* ^ • •• ^!l* l»« - American Fern Journal Volume 25, Plate 5. Please note that these images are extracted from sc
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