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appear Archaeopteris Arthrostigma gracile Daws Band 57 basal belong bifurcating branch-systems breadth Bryophyta Campbellton Canada capsule Carboniferous carbonized central strand cimens Dawsonites arcuatus diameter dichotomously Drepanophycus evidence ferruginous figured by Dawson flattened forms fossil fossil plants fronds furrows genus Geol geological age Hostimella Ibidem impressions Kidston Kristiania laminae lateral branches Lepidodendron longitudinal Lower Old Red main axis main branch markings microphyllous Middle Devonian Nathorst occurrence Old Red Sandstone ornatum Pachytheca Palaeozoic paper pinnules plant-bearing plant-remains Potonie & Bernard preserved probably Prof Prototaxites Psilophyton Goldschmidtii Psilophyton princeps Daws pteridophytic rachis regarded represent rhizome Roragen flora scars Scotland seen shown in pl Silurian similar slender Solms-Laubach species specific identity specimen in fig specimen in pl specimen shown specimens figured spine-bearing spines sporangia sporangium spores sporiferous zone sporogonium stalk stems striation structure Stur surface sympodial thick thorn-like tissue tracheids type-specimen Upper Devonian vascular strand vascular tissue