https://nmgs.nmt.edu/publications/guidebooks/downloads/43/43_p0145_p0150.pdf
Hunt, A. P., & Lucas, S. G. (1992). The paleoflora of the lower Cutler Formation (Pennsylvanian: Desmoinesian?) in El Cobre Canyon, New Mexico and its biochronological significance. In 43rd Field Conference Guidebook (pp. 145-150).
http://books.google.com/books/about/Upper_Westphalian_and_Stephanian_Species.html?id=Qha9oQEACAAJ
Alethopteris fronds were probably bipartite, tri- or quad- ripinnate, and attained considerable size (Laveine et al., 1993a). Laveine (1986) reported on a specimen observed in a coal mine in northern France that was 7.4 m long and �2 m wide. All species of Alethopteris are believed to have been borne by medullosan pteridosperms, and there is at least one report of anatomically preserved Alethopteris pinnules from the Upper Pennsylvanian of the Appalachian Basin organically attached to axes exhibiting Myeloxylon petiole anatomy. This morphogenus is known to have been borne on a Medullosa noei stem (Pryor, 1989). Based on material from the Sydney Coalfield (Nova Scotia, Canada), Zodrow (2007) provided a tentative reconstruction of the A. zeilleri
Figure 16.15
Bar � 2 cm.
Alethopteris pinna with pinnules (Pennsylvanian).
CHAPTER 16
LATE PALEOZOIC AND MESOZOIC FOLIAGE 657
plant as a small tree, 5–7 m high, with relatively large fronds to which are attached Pachytesta incrassata ovules and Dolerotheca-type pollen organs (Chapter 15).