Fossil Plants: a Text-book for Students of Botany and Geology. Vol. Iii.

anatomical apex apical Arber axis base Bertrand bracts broad Brongniart Carboniferous Cardiocarpus cells centripetal xylem characterised Cladoxylon Coal Measures Cordaitean Cordaites cortex Cycadean Cycadeoidea Cycads Cycas cylinder Dadoxylon described diameter epidermal Flora fossil fronds genera genus Goeppert Grand'Eury Heterangium Ibid inner integument Jurassic Kidston Lagenostoma lamina leaf leaf-bases leaf-traces leaves longitudinal lower Lyginopteris medullary rays Medullosa mesarch Mesoxylon microspores microsporophylls Myeloxylon narrow Nathorst Neuropteris nucellus occur outer ovules Palaeozoic parenchyma Permian petiole petrified phloem pinnae pinnules pith pits plants pollen-chamber primary xylem protoxylem Pteridosperms Ptilophyllum rachis radial recent Cycads region Renault represented resemblance ribs Samaropsis Saporta sarcotesta sclerotesta Scott secondary wood secondary xylem seeds Seward shown in fig Solms-Laubach species specimens Sphenopteris sporangia sporophylls stele stem strobilus structure testa tissue tracheids transverse section Trigonocarpus type-specimen upper vascular bundles vascular strands veins Williamson Williamsonia xylem and phloem Zalessky Zamites Zeiller