429 OLDER MESOZOIC FLORAS OF UNITED STATES. 
form rays. Our fossil seems to combine certain of the characters here 
given as distinct for the living woods; that is, our wood has dis- 
tinct resin passages, but is without the fusiform rays. But after care- 
ful examination it appears to be most closely related to the genus 
Pinus. It agrees perfectly in having broad growth rings, dentate or 
irregularly thickened walls to the medullary rays, and prominent resin 
passages. It differs in the absence of the fusiform rays. From its 
undoubted resemblance to Pinus I have ventured to regard it as an 
ancestral form of this genus and to give it the name of Pinoxylon. It 
may be possible that the absence of this character of the fusiform rays 
is of such importance that it can not be regarded as the ancestor of our 
modern pines, but on account of its unquestioned resemblance in other 
perhaps equally important characters I have so regarded it. . 
Locality.—Three miles northwest of Sturgis, South Dakota. Proba- 
bly Upper Jurassic. Collected by Lester F. Ward, October 3, 1898. 
DISTRIBUTION OF THE OLDER MESOZOIC FLORAS OF THE 
UNITED STATES. 
To complete this presentation of the status of the Older Mesozoic 
floras of the United States I introduce a table giving all the species 
thus far known, with the general region or area in each formation at 
which they occur. 
Table of distribution of the fossil plants of the Older Mesozoic of the United States. 
Triassic. Jurassic. 
ea Hudson- South- | ¢ 
Valley Potomac western) & ee 
Soane area. area. a|\a 
‘ als 
= | et a 
No. Name. 2 =a /o)8 
& 3/o0!a 
3 ; e SBlaris 
ae ca gl8lg¢ ~|3 | 8 g 
7 | a ™ vo} oo] Ss 
2/2) Fslelsleie a/2/S/ | 5/4 
2lS(Siselslelo/S/ale/2 sis] e]4 
wn] aE pe | ee ae aja 
gle ele(e elei els (Sie)\ 2/8) 2/4 
o1}%la Ral Oo} oO 1'h sS 
2/3 |4j@ ale lazlaz)/<|Sle/6/5 2/8 
1 | Abietites carolinensis Font.'....)....)..--|--.-]----|.---| 
2) Acrostichites brevipennis 
Ward I. Spi..cs #2 <2. anes 26. stares geist eee seer. ees ewe. acl eis ea cial BRE lecescosslescunie' incareiel  cyasete 
3 | Acrostichites? coniopte- 
roides Ward n. sp......... Rewieipstsete |wsters | siete | areeehel| pees lees eeea||tenw SX! ccc aiie ell eve fas selene 
4 | Acrostichites densifolius 
MOU berccrrcis swiverrew os carrsicien 56 a] adarsiell rasa Panesar) eraraes [SOR Nesrardsalfavanetsl) coatave Pave fort wate | oie [odted [eee atallcca: 3 
5 | Acrostichites ? fructifer 
Ward nu Spisccisseccicccisionaee Snccic lore in] incesellee viel aumia'el|nisiornl| samara erase ioversrs| IX lec) aye golfers vere] wunvare 
6 | Acrostichites linneezfolius : 
- PUI OIE anceininensaesoeonsviere ie Well ae. Ser cis UR Lona) OE) BB Lapses Lacs coined awienllnle culling aM agcnl anges 
7 | Acrostichites microphyllus 
FLOW Giese 'scois) nsiciessicisicinsiasaietase stops ae css Meza zie ly 2 Mac csall IN| csassial| acoyuie | versa isteieicl Micvstall ste l cpl in| creer teva 
8 | Acrostichites princeps 
(Presl.) Schenk. csweses 2x je. Saleen ate Siu leyarees late neat call lsasepelheeiarcll miecarell? OD IMewrdalllcieay dlecsces 
9 Acrostichites ten uifolius | 
(Emm.) Font.......-....- ra Oe Ed oe array le Gale al ee a Oe ( ann 
