L, Lesquereuz on the Coal Formations of North America. 383 
8 h 
like sheaths around the articulations, this separation appears 
inadmissible. It is for this reason that most of the European 
Vv 
at least, two species of Asterophyllites bear, in the axils of their 
leaves, those small oval or cordate-oval seeds, observed by Mr. 
Brongniart, and far different from the cones of the same genus 
le 
large stems of Asterophyllites equisetiformis Ll., they contain noth- 
Ing under their scales but a pulverulent matter, as Mr. Brongniart 
48 seen it. Possibly the flattened seeds, in the axils of the leaves 
of Asterophyilites, could be considered as a kind of tubercles; but 
Treally believe they are true seeds and that all the species of the 
_ Cardiocarpum are referable, if not to the genus Asterophyl: 
, at least to plants related to it. At some places where Aste- 
_ Tophyllites are abundant, these seeds are seen sometimes in plenty, 
Varying in form from round or oval to cordiform, eh 
bearing a narrow win g, emarginated at the top, and even broadly 
_ Winged, as shown by the beautiful specimens figured and de- 
Scribed by Dr. Newberry.’ They vary much in size, being 
oy as small as a pea, but sometimes as large as a walnut. 
then, as is evident, these fruits belong to Asterophyllites, or 
to plants related to this genus, it is not possible to refer them 
to EHywisetacece, and so the opinion of Mr. Brongniart is con- 
firmed. But now, the fruits of the genus Culamites are still en- 
trely unknown. A single specimen, figured in Sternberg’s Flora, 
Vol. ii, pl. 14, fig. 1, under the name of Volkmannia arborescens, 
apparently coming from a stem of Calamites, has the form of 
_ 8 long ear or cone, bearing whorls of narrow, linear, obtuse, 
Somewhat open leaves, resembling the cones of Asterophyl- 
: * Annals of Science, No. 13, (May 1, 1853), p. 152, No. 2. 
