Bulletin 3. The flora of the Raritan Formation, 1911 - State of New ...

CONIFERALES. 99
Hollick, Amr. N. Y..&cad. Sci,, vol. I i : 58, 429, pl. 3, f. 4,
5, pl. 36, f. 6, I898; Bull. N,. Y. Bot. Garden, vol. _;
403, pl. 4I, f. z3, I4, 2892.
Frotophyllocladus subi_ItegrifoIius Berry, Bull. T'orrey Club. vob
30:44 o, _9o3 ; Ibid., vol. 31 : 69, pl. z,/. 5, I9o4; Ann.
Rept. State Geol. (N. J.) for 29o5; I39, I9o6; Johns
Hopkins Unfiv. Circ. new ser., I9o7, No. 7 : 89-9 I, [- 6.
Holliek, U. S; Geol. Surv. M_n. 50:36, pL 5, [. x--6, I9o 7.
Deseription.--Leaves oblong to linear iu outline and coriaceous
in texture, from 3 cm. to 27 cnr. in len_h by 0.6 cm. to 3 cm. in
width. Apex usually obtuse, rarely pointed. Base decidedly and
narrowly cuneate to the short petiole. Margins entire below,
above obtusely dentate or tmdulate, with occasionally teeth which
are acute. Midrib stout below becoming" attenuated above and
frequer_tly disappearing some distance below the apex. Laterals
numerous, close, immersed ; they branch at an angle of about 20°,
running nearly straight and approximately pa,rallel to the margin,
sometimes forking. Stomata scattered ou both surfaces,
with typical guard cells.
This is a widespread species ranging" in considerable abundance
from Greenland to New Jersey and west to Kansas and
24ebraska. Ori_nally _'eierred to Ph3'llocladux by Lesquereuax,
his type is almost identical with certain phylloclads of modem
members of this genus. Subsequently discovered remains from
Kansas are considerably larger than the type, as are also a number
of the Greenland specimens. Some of the Raritan forms
have a somewhat different aspect, bei*_glong and narrow; sometimes
the margins ave entire, often they are more or less sharply
toothed.
Much controversy has centered around these forms and
especially around the older5'resozoic forms referred to the genus
Thin_lfeldi_r Ettings., to which these later forms were once referred.
The latter genus has been _eferred successively to the
conifers, ferns and cyeads. There has never been ranch doubt
that the later forms were gymnospermous. The writer can positively
affirm this conclusion, and also that they are true phylloclads
and not leaves in the strict morpholigieal sense.
NEW JERSEY GEOLOGICAL SURVEY