Box 25, Folder 4: Ferns III

Alethopterus marginata Gopp [Fross] Syst. p 301-Lesq.'x Geol Penn 2 p 865 Pecopteris marginata Brongt.

Frond bipinnatifid, pinnae sessile, open, deeply pinnatifid; pinnules contiguous, oblong, slightly obtuse, decurrent, and united together, undulate=sinnate and slightly emarginate; terminal leaflet oblong, lanceolate, obtuse; rachis & medial nerves rough; nervules very slender, perpendicular to the medial nerves, nearly simple.

Coal measure Fremont Pa.

Alethopteri muricata Gopp. Syst. p 313. Lesq. Gevl Penn 2p 865

Pecopteris muricata, Brouguiart pl 95 + 94

Frond bi or tripinnatifid; prunoe or pinnules open, superior leaflets oval=lauceolate, acute, close, slightly decurrent at the base, the inferior: one distant, irregularly pinnately lobed; lobes oval=acute; secondary nerves dichotomous, oblique on the medial nerve, simple or furcate.

Coal measures Pottsville Pa Nova Scotia + New Brunswick also in Europe

Carboniferous

South Joggins & Pictou Nova Scotia; Bathurst, N. Brunswick.

Alethopteris obscura Lesquereux Geol Penn 2 p 865 pl 1 fig 13, 14

Frond bipinnatifid, primae pinnatifid above, pinnules lanceolate, enlarged at the base, united together, and decurrent above, distinct below; deeply undulate on the margins, secondary nerves obsolete, very slender and oblique, bifurcate. Distinguished by the peculiar position of the secondary nerves rising from the narrow undulate medial nerve in a very acute angle

Coal Measures Pottsville Pa

Alethopteris Pennsylvanica Lesquereux Geol Penn 2 p 864 pl 11 fig 1.2.

Inferior pinnae bipinnatifid, with short round pinnules, united half their length; superior pinna pinnate only, with long lanceolate linear & undulate pinnules, slightly decurrent on the rachis, and united at the base.

Perhaps only a variety of A. lonchitides.

Coal Measures Pottsville Pa