. Bulletin of the British Museum (Natural History), Geology. 64 A NEW MESOZOIC FLORA FROM TICO, ARGENTINA dermal cells often cutinised, in contact with guard cells of stomata, smaller than epidermal cells. Trichome bases present in small numbers on both sides, consisting of a round cell about 50-60 /i in diameter on top of normal epidermal cells ; trichome bases sometimes consisting of two cells sharing a thin area. Free part of trichome missing. Holotype.—LIL PB Material.—In addition to the holotype, LIL PB 2558. Slides : LIL 173, 174; Brit. Mus. (Nat. Hist.) nos. Descript
. Bulletin of the British Museum (Natural History), Geology. 64 A NEW MESOZOIC FLORA FROM TICO, ARGENTINA dermal cells often cutinised, in contact with guard cells of stomata, smaller than epidermal cells. Trichome bases present in small numbers on both sides, consisting of a round cell about 50-60 /i in diameter on top of normal epidermal cells ; trichome bases sometimes consisting of two cells sharing a thin area. Free part of trichome missing. Holotype.—LIL PB Material.—In addition to the holotype, LIL PB 2558. Slides : LIL 173, 174; Brit. Mus. (Nat. Hist.) nos. Description.—This species is found in the same bed with Ticoa magnipinnulata and Mesosingeria hetbstii. The dark-brown cuticles are very well preserved. The largest specimens required much longer maceration than the rest of the material. Mesosingeria coriacea gen. et sp. n. Fig. 37. Stoma showing sunken guard cells. Slide LIL 173. X500. Fig. 38. Section of stoma showing projecting rim of cutin over the mouth of the pit and cutinized hypodermal cells. X 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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