490 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1911. 
PLATE 5, 
Stipe bases of three species of Cyathea, showing different kinds of spines and scales. 
Fig. A, C. arborea, valley of the Rio Bayamita, Cuba, Mazon 3909; fig. B, C. 
onusta, vicinity of Coliblanco, Costa Rica, altitude 6,500 feet, May 1, 1906, 
Mazon 318; fig. C, C. aureonitens, forest along the upper Caldera River, 
western Chiriqui, Panama, altitude about 4,800 feet, March 24, 1911, Mazon 
5575. All natural size. 
PLATE 6. 
Young unrolling frond of Cyathea arborea. Photographed at Caguas, Porto Rico, 
June 20, 1901, by Mr. G. N. Collins. Natural size. 
PLATE 7. 
Two pinne of Alsophila aspera, from the vicinity of Mansfield, near Bath, Jamiaca, 
altitude 900 to 1,200 feet, June 2, 1904, Mazon 2405. Two-fifths natural 
size. 
PLATE 8. 
A nearly complete plant of the smallest North American tree fern, Cyathea Nockii, from 
the vicinity of Vinegar Hill, Jamaica, altitude 3,600 feet, June 23, 1904, 
Maxon 2791. About two-fifths natural size. 
PLATE 9. 
Fie. A. Cup-shaped indusia of Cyathea elegans in a very young condition. Specimen 
from the Blue Mountains, Jamaica, Hart 175. 
B. A later stage of the same species, the indusia empty of sporangia and partially 
collapsed. Specimen from Hollymount, Jamaica, altitude 2,500 feet, May 
8, 1903, Maxon 1945. 
Cand D. Entire and ruptured globular indusia, respectively, of Cyathea Brunet. 
Specimen from Coliblanco, Costa Rica, altitude 6,500 feet, May 1, 1906, 
Maxon 332. 
Puate 10. 
Fie. A. Mature sori and shallow saucerlike indusia of Cyathea arborea. Specimen 
from valley of the Rio Bayamita, eastern Cuba, Mazon 3909. 
B. Sori of Hemitelia multiflora, showing the semicircular reflexed, scalelike 
indusia. Specimen from Port Livingston, Guatemala, at sea level, Feb- 
ruary 18, 1905, Deam 483. 
©. Young sori of Alsophila myosuroides, with sporangia all in place, an indusium 
wanting. Specimen from mountains near El Guama, Province of Pinar 
del Rio, Cuba, March 9, 1900, Palmer & Riley 198. 
D. Old sori of Alsophila Schiedeana, showing the nearly bare receptacles, the 
sporangia having fallen. Specimen from vicinity of Cacao (between 
Panzos and Senaht), Alta Verapaz, Guatemala, April 23, 1906, Barber 164. 
All at four times natural size. 
Piate 11. 
A plant of Hemitelia horrida in cultivation at the New York Botanical Garden. Speci- 
men from Dollwood, near Silver Hill Gap, Jamaica, altitude 3,000 feet, 1909. 
