. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 56 THE ARCHAEOPTERIS FLORA [en. mented, nodes curved, irregularly branched. There may be 1-2 branches on each node. Leaves shortly stalked, borne in whorls of four at the node, dichotomously divided, margins finely toothed, veins fan-like. Fructification a catkin-like body, up to 32 cm. long, with short internodes; sporophylls whorled,? forked dichotomously, ? all fertile in the lower parts; sporangia con- taining megaspores. Distribution. Upper Devonian, Bear Island. This very interesting type is a now well-ackno
. Devonian floras; a study of the origin of Cormophyta. Paleobotany -- Devonian. 56 THE ARCHAEOPTERIS FLORA [en. mented, nodes curved, irregularly branched. There may be 1-2 branches on each node. Leaves shortly stalked, borne in whorls of four at the node, dichotomously divided, margins finely toothed, veins fan-like. Fructification a catkin-like body, up to 32 cm. long, with short internodes; sporophylls whorled,? forked dichotomously, ? all fertile in the lower parts; sporangia con- taining megaspores. Distribution. Upper Devonian, Bear Island. This very interesting type is a now well-acknowledged member of the Sphenopsida. It is a very rare AW Fig. 28. Archaeopteris hibcrmca, (Forbes), from the Upj)er Old Red of Kiltorkan, Ireland. (1) Complete frond (greatly reduced). (2) Fertile portion of a frond (much reduced). (8) Sterile pinnules (reduced). After Carruthers (1872). Palaeophyllales 1, Psygmophyllwn, Schimper, 1870 (Fig. 27, p. 55). Leaves large, flabellate or cuneiform, arranged spirally on an axis, sheathing at the base, which is fairly broad and not con- tracted to a slender petiole. Apex broad, rounded or trun- cated, entire or lobed, or slightly divided. Nerves flabel- late. Fructification entirely unknown. Distribution. ? Lower De^'o- nian, Spitzbergen; ? Middle Devoniaii, Western Norway; Upper Devonian, Ellesmere- land, Spitzbergen, Canada and United States; Lower and Upper Carboniferous. This is a ^'ery striking and Avidely distributed genus in Devonian rocks. A monograph of it was published by the 1 Arber (1912), p. 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 Arber, E. A. Newell (Edward Alexander Newell), 1870-1918; Arber, Agnes Robertson, 1879-1960. Cambridge, The University Press
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