1GS DESCRIPTIVE CATALOG I K 



The cells of the rays all alike, generally smooth-walled, and 

 without abietinean pitting (which is present in a few species) ; 

 pits in the radial walls of the rays generally circular or oval, 

 simple, small, and in groups of 1 to 6, seldom more, per 

 tracheid-field. 



The original diagnosis given by Goeppert is as follows : 

 " Truncorum structura fere Cupressinearuni viventium. Trunci 

 ipsi e cortice, ligno et medulla magis minusve central! form at i. 

 Corticis pars fibrosa cellulis quadrangulis perispheriois, lignum c 

 stratis concentricis angustis distinct is. strati zona exteriore 

 plerumque angusta e cellulis pachystichis compres.sa, interiore 

 iinilto latiore e vasis leptotichis formata, medulla ipsa e cellulis 

 paucioribus pachytichis composita. Cellulae ligni prosenchyma- 

 tosae, porosae ductibus resiniferii simplicibus interjectis. Pori 

 rotuudi in simplici, in truucis annosioribus quoque duplk-i 

 interdura tri- vel quadroplici serie in eodem piano hori/ontali 

 juxtapositi, in iis plrrnmque tantum cellularum parit-tibus. (jui 

 sibi oppositi et radiorum medullnrium parallel! sunt vt-1 in 

 parietibna radiis medullaribus obversis intcnluin nonnulli vcl 

 etiam plurimi taraen minores in omnibus inveniunter. Hudii 

 medullares similares minores simplici cellularum paivnchyma- 

 tosarum porosarum scrie. Parietes earum su])eriore8 et inf'criorcs 

 poris minutis, laterales majoribus instruct!. Ductus resinifcri 

 plerumque simplices cellulis elongutis Bubquadrangulis supcr- 

 positis formati inter ligni cellulas imprimis angustiores inveni- 

 untur." 



Kraus revised and rediagnosed the genus in ls<>4, and nirain 

 in 1870, in Schimper's 'Paloontologie' (p. 374), where he changed 

 the generic name to Cupressovylon. His diagnosis was then as 

 follows: "Lignum stratis concentricis distinctis, angustis; 

 cellulis prosenchymatosis porosis, poris magnis, rotundis, uni- 

 vel pluriserialibus oppositis; cellulis resiniferis creberrimis, 

 ductibus resiniferis nullis ; radiis medullaribus simplicibus/' 



The "genus" is, of course, composite, containing the repre- 

 sentatives of various living groups, and it is very large, perhaps 

 the largest of all the genera of petrified woods, numerous species 

 having been described from the Meso/.oic and Tertiary strata 

 from all parts of the world. Among the earlier records, refer- 

 ence should be made to Mercklin's (ISoo) fine illustrations of 

 species of Cupretritioxylvn from deposits varying from Jurassic 



