USNM 37576 Credneria basinervosa Hollick  

Notes

Hollick (1930)

Pl.56, Fig. 1

 

 

Locality

From Hollick (1930) (p. 89)

"Yukon River, north bank, about 17 miles above Nahochatilton (original No. 2AC236); collected by A. J. Collier and Sidney Paige in 1902 (lot 2963)."

 

Locality Map

 

Description

From Hollick (1930) (p. 89)

"Leaf of medium size, shape unknown, widest in the upper part, narrowed below to a broad truncate, entire base; nervation pinnate subpalmate, arranged in four or more pairs of opposite, subparallel secondary nerves that leave the midrib at approximately uniform, acute angles of divergence, the lower pair basilar or subbasilar and simulating lateral primaries, somewhat spreading, with numerous subparallel branches on the under sides that extend sharply upward toward the margin; midrib straight, expanded between the two lower pairs of secondaries, subpeltate(?) at the extreme base of the leaf; basilar veinlets obscurely defined."

 

Remarks

From Hollick (1930) (p. 89)

"This leaf belongs in the group of species that have the midrib expanded in the lower part; but it is unique in having this expansion above instead of below the lower pair of secondaries. These secondaries are basilar or subbasilar instead of suprabasilar, and the leaf is apparently obscurely peltate at the extreme base; or possibly this apparent feature may represent merely an overlapping of the margin on each side."