48 MISC. PUBLICATION 4 7 7, U. S. DEPT. OF AGRICULTURE 



The forma kuntzei is very thoroughly confused. The type of this 

 form {Kuntze 2282. at the New York Botanical Garden) is not con- 

 specific with Q. costaricensis but belongs to Q. copeyensis, a species of 

 Lepidobalanus. A duplicate of this number in the National Museum 

 is clearly Q. costaricensis but scarcely deserves distinction as a form 

 of that species. Trelease does not state which specimen actually is 

 the type, but this is determined by his illustration of the type which 

 is so designated in the explanation of his plate 283. Q. endresi is 

 simply an elongate leaf form of this species. 



Specimens examined: 



COSTA RICA.— Without further data, Warscewicz 53 (G). Prov. Sax Jose: 

 Cerro de las Vueltas, December 29. 1925- January 1, 1926. Standley and Valerio 

 43-564- and 43671 (F, US). Prov. Cartago: Volcan Irazu, Papales de San Juan, 

 January 1. 1901. Pittier 14120 (US[2]); Volcan Irazu. June 24. 1874, Kuntze 2282 

 (US [tvpe number but not conspecific with the type of f. kuntzei Trel.j) ; Kuntze 

 2352 (NY); August 4-5. 1920. Rowlee and Stork 940 (NY, US): June 28. 1923. 

 Stork 347 (US): December 1. 1937- January 1. 1938, Allen 672 (F. MBG) : Octo- 

 ber 27, 1940. Seibert 1619 (USX A) ; east of Volcan Irazu. Past ores Finca of David 

 Gutierrez, Mar 17. 1925. Stork 2089 (F) : southwest of Volcan Irazu, Sabana Azul 

 near Revantado. January 25. 1889. Pittier 871 (US). 



Series Irazuenses Trel., Mem. Nat. Acad. Sci. 20: 144. 1924. 



Medium-sized trees; twigs somewhat thick, glabrate; buds ovoid- 

 fusiform, the stipules caducous or somewhat persistent; leaves large, 

 narrowly elliptic to lanceolate or oblanceolate, entire, soon glabrate, 

 impressed-veiny above, prominently raised-reticulate beneath, very 

 short -petioled; fruit biennial (?), medium-sized, short-stalked, the 

 cup scales thin, appressed, canescent. 



Range: Sierra Madre Oriental of Mexico and mountains of Costa 

 Rica. 



Includes: Quercus irazuensis Kuntze (type) and questionably the 

 Mexican Q. rysophylla TVeatherby. 



23. Quercus irazuensis Kuntze, Rev. Gen. PL 2: 641. 1891. 



Medium-sized or large tree. Twigs 1.5 to 3 or 4 mm. thick, fluted, 

 dark brown, from fulvous-tomentose quickly glabrescent, becoming 

 grayish the second year with few small raised lenticels. Buds about 

 3 or 4 mm. long, ovoid, obtuse or acute, sparsely fulvous-tomentose; 

 stipules caducous or persistent, 8 to 10 mm. long, light brown or buff, 

 sparsely tomentose. Leaves evergreen, thin but firm and coriaceous, 

 6 to usually 10 or even 18 cm. long, 2.5 to usually 4 or even 6 cm. 

 broad, narrowly elliptic to elliptic-lanceolate, short-acuminate to 

 obtuse or rarely individually rounded at apex, the base narrowed, 

 rounded or cordulate, entire or slightly undulate above the middle, 

 cartilaginous-re volute, upper surface not bullate, glossy and glabrate 

 or sometimes stellate-pubescent at the base of the midrib, impressed- 

 reticulate. the midrib and principal veins raised within the depressions, 

 lower surface dull, prominently raised-reticulate, the lamina obscurely 

 bullate and usually markedly concave between the raised veinlets; 

 veins about 10 or 12 on each side, often with evanescent intermediates, 

 much branched and conspicuously anastomosing, often doubly or 

 triply so, prominently raised (including the reticulum) beneath, 

 impressed and the principal ones raised within the depressions above ; 

 petioles 2 to 3 mm. long, from fulvous-tomentose glabrescent or for a 

 time persistently stellate. Catkins and fruit? (See pis. 62 and 63.) 



Range: Mountains of central Costa Rica. 



