. Fossil plants : for students of botany and geology . Paleobotany. 440 BENNETTITALBS [p^- distal ends characterised by a patch of lighter and thinner-walled cells at the apex (fig. 554); the micropylar tubes are shghtly expanded at the summit and their epidermal cells are papillose as in Williamsonia scotica (cf. fig. 563, B). Nathorst in 1909 adopted the name Williamsonia pecten Carr.^ for the specimens originally referred to W. Lechenbyi as well as for microsporophylls that he believed to belong to the same plant as the ovulate strobili: but in a later paper^ he restricts the name Williamso

• Contributor: Central Historic Books / Alamy Stock Photo
• Image ID: PG06JJ
• File size: 7.2 MB (200.5 KB Compressed download)
• Releases: Model - no | Property - no
• Dimensions: 2395 x 1044 px | 40.6 x 17.7 cm | 16 x 7 inches | 150dpi

More information

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

. Fossil plants : for students of botany and geology . Paleobotany. 440 BENNETTITALBS [p^- distal ends characterised by a patch of lighter and thinner-walled cells at the apex (fig. 554); the micropylar tubes are shghtly expanded at the summit and their epidermal cells are papillose as in Williamsonia scotica (cf. fig. 563, B). Nathorst in 1909 adopted the name Williamsonia pecten Carr.^ for the specimens originally referred to W. Lechenbyi as well as for microsporophylls that he believed to belong to the same plant as the ovulate strobili: but in a later paper^ he restricts the name Williamsonia fecten to-the male strobih, reserving W. Lechenbyi for the ovulate forms, as there is no proof that both were borne on the same plant. From the evidence at present available it is reasonable to regard W. Lechenbyi as a unisexual flower. In all probability the fronds. Flo. 554. Williamsonia Leckenbyi. Mioropyle and interseminal scale. (After Nathorst.) known as Ptilophyllum pecten are the fohage of the parent-plant of W. Lechenbyi, though in the absence of proof it is advisable to retain both names. Williamsonia whitbiensis Nathorst. Under this name Nathorst^ described some interesting speci- mens of microsporophylls formerly attributed by him to William- sonia pecten, but the discovery of additional material led him to distinguish the Whitby (Lower Bstuarine) fossils as W. whitbiensis, retaining the name W. pecten for the type originally figured by Leckenby* from the Middle Bstuarine series at Cloughton Wyke on the Yorkshire coast. In the type-specimen, 8—10 cm. in 1 Carruthers (70) p. 694. ^ Nathorst (11) p. 19. " Nathorst (11) p. 9, Pis. n., m. See also Nathorst (09) p. 8, Pis. i., n. * Leckenby (64) A.. 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 work.. Seward, A. C. (Albert Charles), 1863-1941. C