. Contributions from the Osborn Botanical Laboratory. Plants. 286 EVANS. may be as much as mm. in well-developed plants. The wings are plane or somewhat convex and are mostly fifteen to twenty-five cells across in the type material, although Stephani gives the width as only twelve cells. According to his statements the alar cells measure 36 X 27 /x, and these figures agree pretty closely with the general average of 33 X 26 n, obtained from the five specimens listed above. The cells, as he notes, are essentially thin-walled throughout, although vague indications of trigones are sometimes pr
. Contributions from the Osborn Botanical Laboratory. Plants. 286 EVANS. may be as much as mm. in well-developed plants. The wings are plane or somewhat convex and are mostly fifteen to twenty-five cells across in the type material, although Stephani gives the width as only twelve cells. According to his statements the alar cells measure 36 X 27 /x, and these figures agree pretty closely with the general average of 33 X 26 n, obtained from the five specimens listed above. The cells, as he notes, are essentially thin-walled throughout, although vague indications of trigones are sometimes present. In well-developed thalli the whole ventral surface, including both the costa and the wings, is covered over with crowded hairs, giving it a pubescent appearance. These hairs are mostly mm. in. Fig. 3. Metzgeria corralensis Steph. A. Part of a thallus showing costa and adjoining cells of wings, dorsal view, X 50. B. Transverse section of costa, X 100. C. Costa and adjoining alar cells of a male branch, showing ventral hairs, X 100. D. Gemma at time of separation, X 100. E. Germinating gemma, X 100. A, D and E were drawn from a specimen collected on the Osarno Volcano; B and C, from a specimen collected at Arique by Lechler. length and 10-12 fj, in diameter. Those along the margin, which are essentially like the others, sometimes spread widely and sometimes grow downward; they usually arise singly, as Stephani notes, but twinned hairs may occasionally be demonstrated. Between the densely pubescent ventral surface, which is doubtless typical for the species, and a smooth or nearly smooth condition, all gradations occur, although it is doubtful if a thallus is ever smooth throughout. In the specimens studied by the writer a few male branches are pres- ent and are mostly mm. in length by in width. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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Keywords: ., bookcollectionbiodiversity, bookcollectionnyb, booksubjectplants
