JSrO. 1867 AMERICAN FERNS — CHRISTENSEN 387 



DRYOPTERIS ATROVIRENS C. Chr. 



(Revision" 316, No. 61, Fig. 39.) 



Guatemala: Trail between Sepacuite and Secanquim, Alta Verapaz, 1,000 

 meters, rocky bank in humid forest, Alaxon and Hay 3281 (type 

 number). 



GROUP OF D. SPRENGELII 



Tertiar}^ veins dose, 10-12 to a side, lamina in most species 

 abruptly attenuate downwards, with several pairs of greatly reduced 

 pinnse, which appear as mere warts upon the stem. A distinct aero- 

 phore is often present at the base of the larger pinnee. Most of the 

 species belonging to this group are large, having leaves often more 

 than I meter long. 



DRYOPTERIS SPRENGELII (Kaulf.) Kuntze 



(Revision 318, No. 65, Fig. 42.) 



St. Tho.mas : Signal Hill, 1,400 ft.. Eggers 32. 



St. Kitts : Molyneaux Estate, Britton and Cowell 312. Lambert Estate, 



Britton and Cowell 637. 

 Dominica : Soufriere, Lloyd 543. 

 St. Vincent: Mt. St. Andrews, 2,000 ft., in locis umbrosis inter herba, 



Eggers 6807. Chateau Belair, 1,000 ft., in sj-lvestribus umbrosis, 



Eggers 6843. 

 Grenada: Without locality, Murray and Elliott 9; Slierring. 

 Tobago : In sylvestribus ad flumen Great Dog River, Eggers 5757. 

 Trinidad : Fendler 22. 

 Porto Rico: Luquillo Mts., Percy Wilson 62; 255. Guayama Road, Goll 



601. Quebrada Arriba, on rocky hillside, Goll 488. Road from Ponce 



to Adjuntas, Underwood and Griggs 764. Road from Utuado to 



Lares, Underwood and Griggs 108. San Juan, Mr. and Mrs. A. A. 



Heller 676. On the Adjuntas road, eight miles from Ponce, Heller 



6137; 6346. 

 Jamaica : Near Priestman's River, 75 to 300 meters, partially shaded 



moist bank, Maxon 2529; 2532. Swift River near Hope Bay, Alex. 



Moore. 



The specimens enumerated above belong to typical D. Sprengelii, 

 characterized by its almost hairless surfaces and rachis and its gland- 

 ular under side. In the specimens from Jamaica, especially Maxon 

 2529, the upper side is, however, somewhat more hairy than in the 

 plants from the smaller islands ; thus, it is intermediate between the 

 type and the Central American form. This has the upper side finely 

 pubescent and the rachis somewhat hairy, as is the case in D. Mer- 

 airii : but it agrees very well with the type in habit. This form, 



