. Studies in fossil botany . Paleobotany. 398 STUDIES IN FOSSIL BOTANY up to the date of Mr. Kidston's discovery. In the meantime a number of other species had been described, some with the Sphenopterid and others with the Pecopterid type of foliage. Mr. Kidston's specimens were found in ironstone nodules from the Dudley Coal-field (Westphalian series) (Fig. 152). The specimens are preserved in the form of casts, but the cavities in some cases are infil- trated with carbonate of lime, and so retain their natural form, with some degree of structural pre- servation. Though most of the fertile sp
. Studies in fossil botany . Paleobotany. 398 STUDIES IN FOSSIL BOTANY up to the date of Mr. Kidston's discovery. In the meantime a number of other species had been described, some with the Sphenopterid and others with the Pecopterid type of foliage. Mr. Kidston's specimens were found in ironstone nodules from the Dudley Coal-field (Westphalian series) (Fig. 152). The specimens are preserved in the form of casts, but the cavities in some cases are infil- trated with carbonate of lime, and so retain their natural form, with some degree of structural pre- servation. Though most of the fertile specimens bear no sterile pinnules, in some cases the two forms fig. »ss^Camni,viausi. Fertile occur in organic connec- pinna in connection with sterile pinnae of tjon (see FJ„ T53) prov_ Spkenopterts Homnghausi (leaf of Ly- v & J o Jt f ginodendron\ x 2. R. S. Fromasketch ing that the CrOSSOtkeCO. after a photograph lent by Mr. Kidston. was borne on foliage identical with that of Lyginodendron. Fig. 152, from a photograph, shows clearly the general structure and arrangement of the fertile pinnules, which are oval in form, about mm- m length, and borne on stout" pedicels, the mode of insertion rendering them somewhat peltate. The pinnule is of some thickness, and appears to be traversed by a branched vein. " Each fertile pinnule usually bore six, rarely seven, bilocular micro- sporangia. They are fusiform and end in a sharp ; 1 The sporangia are described as convergent 1 Kidston, Microsporangia of Pteridospermeac, p. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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