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Geological Survey of Illinois Volume 4

Geological Survey of Illinois Volume 4


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1870 Excerpt: ... Ia considering the form of its fructifications, this species should be separated as the type of a peculiar genus. Mazon creek; in concretions of clay iron ore. Alethofteris Hallii, Sp. nov. PI. x, fig. 7 and 8. Frond bi-pinnate; pinnae perpendicular to the straight round mainrachis, linear, alternate, narrow, close to each other, apparently short, merely cut on the borders by obtuse narrow lobes, either emarginate or square at the top, separated by short obtuse sinuses. Veins and veinlets deep and narrow, the primary ones ascending to the middle of the sinuses and forking twice upwards as seen in fig. 8, enlarged. This species is closely related to Alethopteris scrrnla, Lesqx., Penna. Geo!. Report, p. 865, pl. xii, fig. 1, differing from it by its shorter, broader pinnae, placed close to each other; by its more obtuse lobes, and by the primary divisions of the veins, ascending to the middle of the sinuses, and not to the point of the lobes. Though in both species the borders of the pinnules are apparently reflexed, these differences are too marked to be considered mere varieties of the same species. Nevertheless, it might be possible that the specimens from Illinois represent a sterile frond, and those of Pennsylvania fruiting branches of the same species. Mazon creek; in concretions found by Mr. M. S. Hall. Alethopteris Erosa, Gein. Verst., p. 29, PI. 32, fig. 7-9. Pecopteris Erosa, Gutb. (1843.) Numerous and large specimens referable to this species have been found by Mr. S. S. Strong, in the roof shales of the coal at Morris. The American plant merely differs from that of Europe by the longer divisions of the three-pointed lobes, and by the much longer pinnae. The same fronds, or parts of fronds, bear sterile and fruiting pinnae; those especially in the ...


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Product Details
  • ISBN-13: 9781154080988
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 204
  • Spine Width: 11 mm
  • Width: 189 mm
  • ISBN-10: 1154080986
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 426 gr


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