A new genus of lycopods from the Devonian of New York State

Abstract

~ Z P u Yosk 14853, U.S..I. f h r p n n i $~y r i c~ colnphy1lu.i Grirrson & Banks is transferred to flizskinsia Grierson & Banks on the Ixisis of the rnorpliology of its leaves and its anatomical structure. Slender, dichotomizing axes b a r helically arfiiiigrd I c~v r s that iirr falcatr, petiolate, simple, Ianceolate and entire. A solid cylinder of metaxylein is surrountlrd lq ridges of protoxylern. Pitting on tracheid w;ills is annular, helical, reticulate, sc;il;trifi)nn t o circiil;ir-l)ortlrred. 'l'his lycopod extends from early Givetian into early Frasnian time in the Catskill strata of rastrrn N r w York State. The d e r t of clravage of fossiliferous rock on patterns ohsened 011 ttir rxposed fossils mid the Ixiring of Ipcrnt rrsrarch on the Lbssil histor) of lycopods ;irr disc iissrd. m24 4074/8:3/010081 +21$03.00/0 (') 1983 The Linnean Society of Londona4

Middle Devonian lycopsids from high southern palaeolatitudes of Gondwana (Argentina)

“…In localities where diverse floras have been recovered from a considerable thickness of sediments, monospecific mats of Haskinsia have been found restricted to only certain beds (Berry & Edwards, 1996;Grierson & Banks, 1983). Our discovery therefore remains uninformative in this regard.…”

“…According to the morphological characteristics observed, particularly those of leaf morphology, these fossils correspond to the genus Haskinsia Grierson & Banks (1983) as emended by Bonamo, Banks & Grierson (1988). The history of this genus, and probable synonymy to Artschaliphyton Senkevich, are discussed by Berry (1997).…”

“…Haskinsia was originally recorded in New York State, in sediments assigned a latest Eifelian-early Frasnian age, first under the name Drepanophycus colophyllus (Grierson & Banks, 1963) and then as Haskinsia colophylla (Grierson & Banks, 1983). Grierson & Banks recognized the deltoid morphology of the leaves but did not see the downwards-pointing lateral corners of the leaves.…”

Gilboaphyton argentinum sp. nov.: A herbaceous lycopod from the early Carboniferous of Argentina

“…Later, Kidston (1901) included the North American specimens together with those from the Early Carboniferous of Great Britain in the genus Archaeosigillaria, and designated A. vanuxemi as type species. Lacey (1962) and Grierson & Banks (1963) carried out amendments to the generic diagnosis of Archaeosigillaria. Lacey incorporated cuticular details, while Grierson & Banks (1963) included aspects of leaf morphology.…”

Devonian plants from Colombia, with discussion of their geological and palaeogeographical context

“…Leaves of Minarodendron (Li, 1990) have three segments of which the central segment is perpendicular to the other two and differs also in that the margins are serrate. Colpodexylon is well known from the Devonian strata of New York State (Banks, 1944;Grierson & Banks, 1963). Two species (C. deatsii, C. trifurcatum) were originally distinguished by Banks (1944) on the basis of measurements of leaf and sporangial dimensions.…”