. Contributions from the Osborn Botanical Laboratory. Plants. 284 Alexander W. Evans, elaters, so that his statements about the inflorescence and elaters must have been based on a misconception. The thallus of M. papillata is even smaller than in M. domin- gensis; it is, in fact, the smallest American species known at the. Fig. 13. Marchantia papillata Raddi Appendages of ventral scales and other anatomical details. A-E. Appendages of ventral scales, B and C having been dissected from the same thallus, x 100. F. Epidermal pore of thallus, surface view, x 225. G, H. Pores in cross-section, x 22
. Contributions from the Osborn Botanical Laboratory. Plants. 284 Alexander W. Evans, elaters, so that his statements about the inflorescence and elaters must have been based on a misconception. The thallus of M. papillata is even smaller than in M. domin- gensis; it is, in fact, the smallest American species known at the. Fig. 13. Marchantia papillata Raddi Appendages of ventral scales and other anatomical details. A-E. Appendages of ventral scales, B and C having been dissected from the same thallus, x 100. F. Epidermal pore of thallus, surface view, x 225. G, H. Pores in cross-section, x 225. I. Inner opening of pore, x 225. J. Stalk of female receptacle, cross-section, x 40. K-M. Parts of involucres, x 100. A. Brazil, G. Raddi, type. B, C, G, J, K. Paraguay, B. Balansa 4006. D-F, H, I. Bolivia, R. S. Williams 2145. L, M. Peru, R. Spruce, type of M. subandina. present time. So far as the structure of the thallus is concerned the agreement with M. domingensis is very close. Slime cells seem to be always lacking in both species and sclerotic cells are usually abundant and equally conspicuous. The appendages of the median scales, moreover, are essentially the same, although the marginal teeth in M. papillata exhibit a shghtly wider range. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osborn Botanical Laboratory. [New Haven?] Osborn Botanical Laboratory, Yale University
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