. Bulletin of the Natural Histort Museum. Geology series. t h^: I 'A. Fig. 6 A-E Phoenicopsis rincewindii sp. nov. All thinner (? lower) cuticle. A, widely distributed stomata scarcely avoiding veins. , LM. x 125; B, holotype, outer surface less strongly ridged than that of thicker cuticle seen in Fig. 4, , SEM. x 500; C, stomata showing subsidiary cells with more thickly cutinized periclinal walls than surrounding cells and pits overhung by papillae of lateral subsidiary cells; details of adjacent stomata on left shown in , LM. x 500; D, outside view of a stoma sh
. Bulletin of the Natural Histort Museum. Geology series. t h^: I 'A. Fig. 6 A-E Phoenicopsis rincewindii sp. nov. All thinner (? lower) cuticle. A, widely distributed stomata scarcely avoiding veins. , LM. x 125; B, holotype, outer surface less strongly ridged than that of thicker cuticle seen in Fig. 4, , SEM. x 500; C, stomata showing subsidiary cells with more thickly cutinized periclinal walls than surrounding cells and pits overhung by papillae of lateral subsidiary cells; details of adjacent stomata on left shown in , LM. x 500; D, outside view of a stoma showing elongate pit overhung by subsidiary cellpapillae, , SEM. x 500; E, cuticle viewed from the inside showing pitted anticlinal walls to ordinary epidermal cells and stoma, , SEM. x 500. Order GINKGOALES Genus GINKGOITES Seward 1919 Ginkgoites Seward: 10. [formal diagnosis not given] 1935 Ginkgoites Seward; Harris: 48 1936a G»7/:go/rei Seward; Florin: 105 1968 Ginkgoites Seward; Tralau: 67 1972 Ginkgoites Seward; Krassilov: 24 1974 Ginkgoites Seward; Harris & Millington: 4. [dropped in favour of Ginkgo L.] 1997 Ginkgoites Seward; Zhou: 190 1999 Ginkgoites Seward; Watson et at 721 Type species. Ginkgo obovata Nathorst 1886: 93, pi. 20. fig. 3. [Cited by Andrews, 1970] Diagnosis, [emended by Watson et al 1999: 721] Fossil leaves occurring singly. Petiole distinct, enlarging abruptly at its top to form lamina. Lamina with straight lateral margins, distal margin forming arc of a circle; shallowly to deeply incised. Veins repeatedly dichotomising, ending separately in distal margin. Cuticle where known with haplocheilic stomata. Remarks. Fossil ginkgoalean leaf genera were discussed at length by Watson etal(\ 999). both in their historical context and in the light of recent discoveries (Kimurat'fo/1983; Zhou & Zhang 1989, 1992; Zhou 1991. 1997; Zhao et al 1993; Czier 1998) with two major difficulties highlighted. First of all. the problem of dealing with lea
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