1953] 



BOTANY OF THE GUAYANA HIGHLAND 



93 



lished by the explorer in a series of reports under the title "Plantae austro- 

 americana." 19 



Along the eastern foothills of the Cordillera Oriental in Colombia is the ex= 

 tensive Serrania Macarena, an enormous sandstone massif, possibly to be associ- 

 ated geologically with the sandstone mountains of Guayana. Only recently it has 

 been the object of a British Museum-Colombian Expedition, the results of which 

 are as yet unpublished. W. R. Philipson, of the British .Museum, was leader of 

 botanical exploration. 



During the fall and winter of 195 1-195 2, 20 the New York Botanical Garden 

 will conduct expeditions to Cerro Guaiquinima in the State of Bolivar, in Vene- 

 zuela, and with the British Forest Department to the northeastern portion of the 

 Pacaraima Mountains in British Guiana. During the 1952-1953 season, the New 

 York Botanical Garden plans to complete this twenty-five year program in the 

 exploration of Cerro Chimanta=tepui and outliers in the Gran Sabana. The further 

 sustained field operation of the Servicio Botanico and the continuing exploration 

 by Mr. and Mrs. Phelps may be expected to augment the collected materials and 

 general knowledge of the region for a long time to come. 



It is hoped that the material and data so gained will have become sufficient 

 for a preliminary floristic treatment of the Guayana Highland. 



Localities, collectors, dates, and exsiccatae numbers of the 

 1948-51 Venezuelan expeditions 



States of Anzoategui and Monagas. 



Bassett Maguire, H. R. Kunhardt, Louis Politi, October 21-November 4, 1948: 

 27207-27304. 



Cerro Sipapo (Paraque), Territorio Amazonas. 



Bassett Maguire, Louis Politi, Bassett Maguire, Jr. (after January 1), Novem- 

 ber 15, 1948-March 15, 1949: 27318-29039. 



Cerro Duida, Cerro Marahuaca, Territorio Amazonas. 



Bassett Maguire and Bassett Maguire, Jr., April 18, 1949-May 21, 1949^ 29040 

 -29221. 



Rio Atabapo, Territorio Amazonas. 



Bassett Maguire, October 17-October 26, 1950: 29222-29345. 



Cerros Duida, Huachamacari, Yapacana, and Moriche, Territorio Amazonas. 



Bassett Maguire, Richard S. Cowan and John J. Wurdack, November 2, 1950- 

 January 21, 1951: 29346-31057. 



Cerro Paru, Territorio Amazonas. 



Richard S. Cowan and John J. Wurdack, January 31, 1951~February 21, 1951: 

 31058-31599. 



Acknowledgements. Acknowledgement of assistance and services is always a 

 pleasant duty, but is regrettably one that never succeeds fully in meeting its 

 genuine obligation to tiie many who contribute so much to successful exploration. 



l9 Bot. Mus. Leafl. 15: 29-78. 1951. et praec. 



"Since this paper has been written, the 1951-1952 expeditions have returned to New 

 York after having completed the explorations noted above, viz. the visits to Guaiquinima, 

 and to the British Guiana-Pacaraima region. In addition Mr. and Mrs. William H. Phelps, 

 Jr. have sponsored an excursion, conducted by 3assett Maguire, to Ilu-tepui, the north- 

 ernmost of the Mt. Roraima chain along the Venezuelan-British Guiana boundary. The 

 botanical results of these latest expeditions will be reported in the course of the publica- 

 tions of this series of papers. 



