1921] ROUND—ODONTOPTERIS 
399 
reveals a much more complex system than that of O. brardii? 
In general the O. genuina has a thin medial nerve, distinct almost 
to the apex, while the lateral veins spread at very acute angles 
ttf ) Wi 
wie t IN) ORSANANG 
NS IN 
Lear ir ais 
Z/IS\ ‘S ON WS 
ZE Ziff (d\n \ \ f iS 
(ZZ AS WN 
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Qa, 
Fic. 2.—Odontopteris genuina: mode of branching; reduced 3. 
and fork in passing to the border one to four times, the lowest 
or outermost only coming from the rachis. 
Typical O. brardii, 
on the other hand, is described as having veins all of which come 
? BRONGNIART, A., Histoire des végétaux fossiles. pis. 75, 76. 1828. 
