482 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Weberocereus tunilla (Weber). 
Cereus tunilla Weber, Bull. Mus. Hist. Nat. 8: 460, 1902. 
Cereus gonzalezii Weber, Bull. Mus. Hist. Nat. 8: 460, 1902. 
Type Locauiry: Near Tablon, southwest of Cartago, Costa Rica. 
Distripution: Costa Rica, Central America. 
16. WERCKLEOCEREUS gen. nov. 
An elongated climbing cactus, the 3-angled or 4-angled branches emitting aerial 
roots, the areoles bearing short circular bristles and a tuft of very short wool; flow- 
ers nocturnal; corolla creamy-white, funnel-form, the tube nearly twice as long as 
the limb; ovary and corolla tube bearing many areoles each with several nearly 
black acicular bristles and a tuft of short black wool; outer perianth segments lanceo- 
late, acutish, the inner broader; stamens many, bluntly pointed; style about as long 
as the longer stamens, with several linear stigmas; berry globose, its apex umbili- 
cate, citron-yellow, the flesh white, the seeds shining (according to Schumann). 
Type species Cereus tonduzii Weber. 
Werckleocereus tonduzii (Weber). 
Cereus tonduzii Weber, Bull. Mus. Hist. Nat. 8: 459, 1902. 
Type LocaLiry: Copey, near Santa Maria de Dota, Costa Rica. 
Distripution: Costa Rica, Central America. 
17. ACANTHOCEREUS gen. nov. 
Night-flowering cacti, with elongated, erect or reclining, 8 to 6-angled rootless 
stems and large funnelform flowers; areoles of the stems distant from each other, 
bearing a tuft of short wool and several stiff spines; ovary with several or many 
areoles bearing wool and spines; corolla-tube green, cylindric, slender, expanded 
only at the summit, bearing a few similar areoles subtended by a small scale, the 
limb somewhat shorter than the tube, widely expanded; sepals narrowly lanceolate, 
acuminate, green, shorter than the white petals; stamens shorter than the petals; 
style very slender, divided at the apex into several linear stigmas; berry (according 
to Schumann@) scaly and spiny, with a thick skin, red flesh, and numerous thick 
black seeds. 
Both Schumann and Berger regard this group as consisting of a single species, 
while Pfeiffer recognized several. Plants cultivated in New York show great differ- 
ences in the length of spines, one from Panama, collected by Cowell, having spines 
of the stem only 6 mm. long or less, while those from Florida and Texas have spines 
up to 2.5 cm. long, agreeing in this with herbarium specimens from Guadaloupe. 
Type species Cactus pentagonus L. 
Acanthocereus was considered a subgenus of Cereus by A. Berger, 
Acanthocereus pentagonus (L.). 
Cactus pentagonus L. Sp. Pl. 467. 1753. 
Cereus pentagonus Haw.; Pfeiff. Enum. Cact. 109. 1837, 
Cereus acutangulus Otto; Pfeiff. Enum. Cact. 107, 1837. 
Cereus baxaniensis Karw.; Pfeiff. Enum. Cact. 109. 1837. 
Cereus ramosus Karw.; Pfeiff. Enum. Cact. 108. 1837. 
Cereus princeps Pfeiff. Enum. Cact. 108. 1837. 
Cereus pellucidus Otto; Pfeiff. Enum. Cact. 108, 1837. 
Cereus nitidus Salm-Dyck, Cact. Hort. Dyck. ed, 2. 212. 1850. 
Cereus variabilis Engelm. Bost. Jour. Nat. Hist. 5: 205. 1845, not Pfeiff. 1837. 
aGesamtb. Kakteen Nachtr. 29. 
