. Fossil plants : for students of botany and geology . Paleobotany. 356 FILICALES founded by Presl may [CH. be de- Laccopteris. This genus, scribed as follows:—• Frond pedate, in habit resembling Matonia pectinata, with pinnate or pinnatifid pinnae; ultimate segments linear, provided with a well-marked midrib giving off' numerous dichotomously branched secondary veins which are in places connected by lateral anastomoses. Sori circular, forming a single row on each side of the midrib (fig. 278, B); sporangia 5—15 in each sorus, with an oblique annulus and tetrahedral spores. The presence of an
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. Fossil plants : for students of botany and geology . Paleobotany. 356 FILICALES founded by Presl may [CH. be de- Laccopteris. This genus, scribed as follows:—• Frond pedate, in habit resembling Matonia pectinata, with pinnate or pinnatifid pinnae; ultimate segments linear, provided with a well-marked midrib giving off' numerous dichotomously branched secondary veins which are in places connected by lateral anastomoses. Sori circular, forming a single row on each side of the midrib (fig. 278, B); sporangia 5—15 in each sorus, with an oblique annulus and tetrahedral spores. The presence of an indusium is not certainly established.. Fio. 263. GleUhenites hantonensis Wank. (Restoration, after Gardner and Ettingshausen.) Schenk^, who described several specimens of Laccopteris from Rhaetic rocks of Germany, compared the genus with Gleichenia but he also recognised the close resemblance to ' Presl, in Sternberg (38) A. p. 115. = Schenk (67) 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. Cambridge : University Press