EARLY CRETACEOUS FLORA OF MONGOLIA

Fig. 170. Samara showing median ridge (raphe), holotype. Shin-Khuduk, 119—3d. x 10.
Fig. 171. Micropylar end of a seed from the coprolite (fig. 174), showing pollen chamber and micropylar canal. Kholbotu-
Gol, 199—2. x 170.
Fig. 172. Samara with reduced wings. Shin-Khuduk, 119—8 a. x 10.
Fig. 173.
Germinated seed. Manlaj, 92—14. x 7.
Fi g- 174 - Coprolite with five seeds. Kholbotu-Gol, 199—2. x 5.
Figs. 175—178. Samaropsis saggitata sp. nov.
Figs. 175, 176. Samara showing thickened chalaza. Shin-Khuduk, 119—3d. x 3 and 10.
Fig. 177. Samara with forking micropyle, holotype. Shin-Khuduk, 117. x 3.
Fig. 178. Saggitate samara. Shin-Khuduk, 119—8a. x 3.
Plate 15
Figs. 179—190. Darneya angusta sp. nov.
Figs. 179—180. Pollen cone, holotype. Bon-Tsagan, 45—19. x 2 and 3.
Figs. 181, 182. Parts of the holotype showing clusters of sporangia projecting over the connective, x 10.
Fig. 183. Cuticle of a connective, holotype. x 170.
Fig. 184. Detached sporangium, x 10.
Fig. 185. Transversely broken pollen cone. Bon-Tsagan, 87—8. x 7. Figured pollen grains are from this cone.
Figs. 186—190. Pollen grains showing distally pendant sacci. x 600, light microscope and 1400, SEM.
Fig. 191. Dispersed pollen grain (the ripe grain of Darneya anugsta?). Shin Khuduk, 119—3d. x 600.
Plate 16
Figs. 192—206. Williostrobus latisaccus sp. nov.
Figs. 192—194. Pollen cone showing split sporangia. Shin-Khuduk, 119—Зс. x 2,5 and 5.
Figs. 195—196. Compact pollen-cone with short stamens. Shin-Khuduk, 118—8c. x 1 and 7.
Fig. 197. Transfer preparation of a pollen cone. Shin-Khuduk, 118—8 c. x 10.
Fig. 198. Pollen cone showing a whorl of bracts at the base, holotype. Bon-Tsagan, 87—8. x 2,5.
Figs. 199—201. Stamens of the holotype showing relatively short, scale-like connectives and split sporangia, x 10.
Figs. 202, 203,205. Dispersed pollen grains supposedly of Williostrobus latisaccus sp. nov. Shin-Khuduk, 119—3d. x 300.
Figs. 204, 206. Pollen-grains from the cones shown in figs. 195—197. x 300.
Plate 17
Figs. 207—211. Pityanthus microsaccus sp. nov.
Fig. 207. Closed pollen cone showing imbricate connectives. Bon-Tsagan, 23—22. x 3.
Fig. 208. Desintegrated pollen cone, showing a portion of an axis and radially spreading stamens, holotype. Bon-Tsagan,
45—19. x 10.
Figs. 209—211. Detached anthers of the holotype. x 15.
Fig. 212. Transfer preparation of an anther showing bulging cells of two sporangia and flabellate connective cell rows,
holotype . x 110, SEM.
Figs. 213—216,
219,226. Pollen grains from sporangia of the holotype. x 300 light microscope, and 1700, SEM.
Figs. 217,218,
220—225. Dispersed bisaccatae pollen grains, supposedly of Pityanthus microsaccus sp. nov. Bon-Tsagan, 45—19 and
Shin-Khuduk, 119—3d. x 300.
Figs. 221, 224. Pollen grains of the same type dispersed with smaller, presumably unripe bisaccates stuck to them. Shin-Khuduk,
119—3d. x 300.
Fig. 225. An exceptional pollen grain with nearly spherical sacci from the same locality, x 300.
Fig. 227. Compressed mass of bisaccate pollen grains (coprolite). Shin-Khuduk, 119—3d. x 100. .
Fig. 228. Anthers in the sheath of a caddis fly case. Bon-Tsagan, 45—19. x 10.
Plate 18
Figs. 229—237. Gurvanella dictyoptera sp. nov. Gurvan-Eren, 239—29.
Figs. 229—232. Two fruit incrustations and their counterparts, x 5 (fig. 230, holotype) and 3 (the rest).
Fig. 233. Fruit enlarged to show the endocarp interior with two locules and the wing, x 10.
Figs. 234—235. Apical parts of two fruits showing venation of the wing, x 10.
Palaeontographica Abt. B. Bd. 181 6