174 



11. Quercus tristis Liebm.: foliis coriaceis brevipetiolatis 

 oblongis v. elongato-lanceolatis obtusalis basi cunealis leviter 

 repandis undulalis margine cartilagineo parum reflexo, supra 

 subrugosis sordide viridibus glabris opacis, subtus fuscescentibus 

 dense granulatis secus costam parce barbalis mox glabris, pe- 

 liolis conipressiusculis glabris; fruclibus subsessilibus v. brevi- 

 pedunculalis solitariis v. geminis, cupula depresse turbinata v. 

 hemisphærica, glande obluse ovoidea v. subglobosa apiculata. 



Arbor mediocris, folia 1£ — 3^" longa, 6—10'" lata, petioli 

 1—3'", cupula 4'" alta 6'" in diametro, glans 5-6'" alta, 

 5'" in diametro. 



Mexico, in declivitate orientali alt. 2500 — 3000' circa Mi- 

 rador, Liebm. Guatimala leg. Skinner (hb. Hook.!); Warsewicz 

 (coll. n. 12, 14, in hb. reg. Berol. !) 



Species affinis Q. tomentosæ W., fructibus sessilibus diversa. 



12. Quercus excelsa Liebm.: foliis membranaceis brevi- 

 petiolatis magnis elongato-obovatis v. elongato-lanceolatis ob- 

 tuse acuminatis basi cunealis grosse sinuato-denlatis, dentibus 

 patulis acutis oblusiusculisve margine cartilagineo parum revo- 

 luto undulato, utrinque glaberrimis, petiolis basi incrassatis 

 supra pianis v. canaliculatis glabrescentibus; fruclibus solitariis 

 sessilibus, cupula . . . ., glande magna ovoidea utrinque truncata 

 apice umbonata apiculata. 



Folia 6—10" longa, 2—4" lata, petioli 2-5'", glans 1£" 

 alta 1^" in diametro. 



Mexico, in sylvis apricis circa Matlaluca Dp. Vera Cruz alt. 

 3—3500'. 



Species affinis Q. corrugatæ Hook. 



13. Quercus Serra Liebm. f: foliis membranaceis brevi- 

 petiolatis lanceolatis acuminatis acutis basi cuneatis usque ad 

 basin sinuato-denlatis, dentibus inæqualibus palentibus plus minus 

 inter se dislantibus aristatis, utrinque glaberrimis nitidis, petiolis 

 acute marginalis supra pianis glabris; fructibus... 



