. Fossil plants : for students of botany and geology . Paleobotany. 78 PTEKIDOSPERMEAE [CH. differ from those of Lyginopteris fronds in the absence of emergences (cf. fig. 404, E). The petioles (fig. 411, B, a) have a single con- centric vascular bundle with internal If If Rg. 413. Sphenopteris (Diplotmema) elegans. A. Forked raohis with bases of lateral branches (Kidston CoU.); B, pinna. (After Stur.) iv. Reproductive organs. As yet no satisfactory evidence has been published with regard to the nature of the microsporangia but in all probability these were constructed on the same
. Fossil plants : for students of botany and geology . Paleobotany. 78 PTEKIDOSPERMEAE [CH. differ from those of Lyginopteris fronds in the absence of emergences (cf. fig. 404, E). The petioles (fig. 411, B, a) have a single con- centric vascular bundle with internal If If Rg. 413. Sphenopteris (Diplotmema) elegans. A. Forked raohis with bases of lateral branches (Kidston CoU.); B, pinna. (After Stur.) iv. Reproductive organs. As yet no satisfactory evidence has been published with regard to the nature of the microsporangia but in all probability these were constructed on the same plan as those of Lyginopteris. There is a strong prima facie case for assigning the seed Sphaero- stoma to Heterangivin: absolute proof of organic connexion is still lacking though Dr Benson's recent account of the seeds. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
