. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. — 50 — DD. Cells of the leaf-middle 2 or more times as long as wide. E. Cells of the leaf-base 5-8 times as long as wide; marginal cells of leaf-apex mostly 1-2 times as long as wide. 3. Trichodon EE. Cells of the leaf-base 1-5 times as long as wide; marginal cells of apex longer than in E. F. Leaves 3-7 mm. long. 5. Ditrichum schimperi FF. Leaves 1-3 mm. long. G. Leaves abruptly narrowed. 5. Ditrichum heteromallum GG. Leaves gradually narrowed. H. Stems 2-5 mm. long; cross section of leaf-vein with 2 rows of guide cells. i. Pleu
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. The Bryologist. Mosses; Liverworts; Lichens; Botany; Bryology. — 50 — DD. Cells of the leaf-middle 2 or more times as long as wide. E. Cells of the leaf-base 5-8 times as long as wide; marginal cells of leaf-apex mostly 1-2 times as long as wide. 3. Trichodon EE. Cells of the leaf-base 1-5 times as long as wide; marginal cells of apex longer than in E. F. Leaves 3-7 mm. long. 5. Ditrichum schimperi FF. Leaves 1-3 mm. long. G. Leaves abruptly narrowed. 5. Ditrichum heteromallum GG. Leaves gradually narrowed. H. Stems 2-5 mm. long; cross section of leaf-vein with 2 rows of guide cells. i. Pleuridium HH. Stems 10-20 mm. long; cross section of leaf-vein with i row of guide cells. 5. Ditrichum I. Pleuridium Plants in low dense cushions. Leaves not crispate when dry, entire or minutely serrulate; vein filling most of the awn, usually rough. Calyptra cucullate. Seta very short. Capsule immersed, ovoid; lid none; peristome none; spores brown, rough.—(Gk. pleuridion = on one side; because the capsule occasionally appears to arise laterally on the stem.) la. Vein rough at tip only; paroicous; perichaetial leaves gradually subulate; spore surface finely granular. Pleuridium holande'i'^ C. Miill.—-Wash, to Calif.. Plate IV.—Pleuridium bolanderi (i) Plants, XI. (2) Plants, X3 (3) Leaf, X32. (4) Leaf-tip, X400. (5) Cells from leaf-base, X^03. (6) Cells from leaf-middle, X403. (7) Capsule; c, calyptra; (after Cardot aid Th'^riot) X about 13. (8) Spore, X550. lb. Vein rough some distance down from the tip; autoicous; perichaetial leaves abruptly subulate; spore surface densely papillose. Pleuriiium alternifolium Brid.—Calif.; Kan. and eastward in the U. S. ^ P. stramineum Lesq.; P. aliernifolium howei R. & C; P. bakeri C. & Th.. 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 work.. Grout, A. J. (