. Bulletin of the British Museum (Natural History), Geology. A NEW MESOZOIC FLORA FROM TICO, ARGENTINA 73 lets, 1-5 mm. diameter, at an acute angle of approximately 45°. Branching in one or more planes. Leaves attached spirally to oval leaf base cushion, largest known 5 mm. long x 1-5-17 mm. broad. Ratio between breadth and length 1 : 2, 3-1 : Brachyphyllum mucronatum sp. n. Fig. 50. Fragmentary branchlet showing a few spirally attached leaves. x 4. Figs. 51, 52. Leaves of normal size. Slides LIL 200, 201. X15. Fig. 53. Stoma showing two ridges on subsidiary cells. Slide LIL 201.
. Bulletin of the British Museum (Natural History), Geology. A NEW MESOZOIC FLORA FROM TICO, ARGENTINA 73 lets, 1-5 mm. diameter, at an acute angle of approximately 45°. Branching in one or more planes. Leaves attached spirally to oval leaf base cushion, largest known 5 mm. long x 1-5-17 mm. broad. Ratio between breadth and length 1 : 2, 3-1 : Brachyphyllum mucronatum sp. n. Fig. 50. Fragmentary branchlet showing a few spirally attached leaves. x 4. Figs. 51, 52. Leaves of normal size. Slides LIL 200, 201. X15. Fig. 53. Stoma showing two ridges on subsidiary cells. Slide LIL 201. X500. Fig. 54. Section of stoma. X500. Free part of leaves typically J of total length. Leaves usually with acute apex, often projecting towards branch axis and mucronate. Venation not seen. Cuticle thick. Apical part of leaves with sharp margin formed by layer of trans- versely projecting cells up to 50 /i long, edge microscopically serrate. Stomata occurring on both sides of lamina and on cushions ; on adaxial side of leaf generally. 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 British Museum (Natural History). London : BM(NH)
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