24 
MR. J. J. COOPER’S COSTA RICA FERNS. 
By J. G. Baxer, F.R.S., F.L.S. 
f ferns now known in the 
country is 182. There can be no doubt that by further exploration 
Gleichenia pubescens H. B. K. Three varieties, the type, a large 
glabrous form, and a third with densely paleaceous rachises.—G. 
pectinata Presl.—G. dichotoma Hook. 
4-6 in. long, {-1} in. broad at the middle; final segments linear, 
crowded, broadly adnate at the base, the central ones longest, 8-9 
lines long, 1-12th in. broad, rather glaucous beneath. Veins 12-15- 
jugate, forked, erecto-patent. Sori medial on h 
sisting at most of four sporangia. Recedes from G. pubescens in 
the direction of G. dichotoma by its crowded leafy lower segments. 
Besides the type there are two well 
Alsophila pruinata Kault. 
The collection contains five other tree-ferns, without sori, or 
otherwise too incomplete for determination. 
Hymenophyllum ciliatum Sw.— H. polyanthos Sw. — H. myrto- 
carpum Hook. 
Trichomanes crispum Sw.—-T’. radicans Sw.—T. rigidum Sw. 
} Dor 
Dicksonia cicutaria Sw., type and var. D.incisa Fée, — rubi- 
y ault, 
Davallia inequalis Kunze.—D. Imrayana Hook.—D. Schlechten- 
dahlii Presl. 
Lindsaya trapeziformis Dry.—L. guianensis Dry. ~ 
Adiantum concinnum H. B. K. — A. tenerum Sw. — A. macro- 
phyllon Sw.—A. patens Willd. 
