. Report on the fossil plants of the lower carboniferous and millstone grit formations of Canada [microform]. Paleobotany; Geology; Paléobotanique; Géologie. â¢'â¢'â <; ^r'i; - n. " 32 LOWER CAUBONIFEUOUS PLANTS. m. the stems of Asteropliyllites as describod by Williaraaon, aad that of Splienophylhim as described by the writer,^ are essentially diflForent from those of Calamitcs. 5. As the species above described indicates, good external characters can be found for establishing species of this genus, and these species are of value as marks of geological age. LycopodiaceiV. Lepidodend
. Report on the fossil plants of the lower carboniferous and millstone grit formations of Canada [microform]. Paleobotany; Geology; Paléobotanique; Géologie. â¢'â¢'â <; ^r'i; - n. " 32 LOWER CAUBONIFEUOUS PLANTS. m. the stems of Asteropliyllites as describod by Williaraaon, aad that of Splienophylhim as described by the writer,^ are essentially diflForent from those of Calamitcs. 5. As the species above described indicates, good external characters can be found for establishing species of this genus, and these species are of value as marks of geological age. LycopodiaceiV. Lepidodendkon aculeatum, Sternberg.â(Plate IX, Figs. 75, 75 a, b, c.) To this species I refer without much doubt the specimens from McKay's Head collected by Prof. Elder, one of which is represented in Fig. 75. This species, especially if, as Schiraper supposes, identical with X. undulatum, ranges both in Europe and America through the whole extent of the Carboniferous system. With the flattened stems of this Lepidodendron were found great quan- tities of the branches, leaves and cones represented in Figs. 77, 78, 80, and which in all probability belong to this or to the next speciesâproba- bly to this; but as the leaves of L. aculeatum are not, I believe, known, I have'no further evidence of this except their juxtaposition. Lepidodendrox radiato-plicatum, S. N.â(Plate IX, Figs. 76, 76 a, b,c.) Description.âLarge stems with very elongate and acuminate rhombic leaf-bases having a strong central furrow and the leaf- scar a little above the centre, and trigonal in form with a single central vascular scar. The spaces between the leaf- bases marked with strong wrinkles radiating from the leaf- bases. Leaf-bases nearly 2 centimetres in extreme length and 5 millimetres in breadth. This plant seems quite distinct from anything else I have met with, and is in very fine preservation, so that the characters can be made out dis- tinctly. Being quite flattened, the denser tissues of the
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Keywords: ., bookauthorge, bookcentury1800, bookdecade1870, booksubjectgeology
