—34— 



of the Rio Grande. The northwest portion is very broken and 

 exploration has revealed Cheilanthes leucopoda, C. Candida, Pel- 

 laea ficxuosa, P. aspcra, and Aneimia Mexicana. (4) The Trans- 

 Pecos district, west of the Pecos. Here we find the highest and, 

 in fact, the only true mountains in the State. Many species of 

 the Southwest district also occur in this and vice versa. Among 

 the ferns peculiar to the region may be mentioned Adiantum tri- 

 cholcpis, Pellaea ternifolia, P. intermedia, Notholaena ferrugi- 

 nea, N. Grayi, Gymno gramme Bhrenbergiana and several others 

 that are also found in New Mexico and Mexico. This district 

 •has only been partially explored, and what is known as the great 

 bend of the Rio del Norte is as yet a terra incognita to botan- 

 ists. 



In Eaton's "Ferns of North America," thirty ferns are ac- 

 credited to Texas, and in Gilbert's "Pteridophytes of North 

 America" eight more are added. Our present knowledge of the 

 fern flora allows us to list the following fifty-one ferns and 

 fifteen allies from the State. Additions, corrections and exten- 

 sions of range will be gladly received by the author. 



OPHIOGLOSSACE^. 



OpJiioglossum valgatum L. Adder's-tongue. The true species 

 has been found only in the bottom lands of the Sabine river, 

 near the Big Sandy. The form Bngelmanni is common in north 

 and central Texas. 



OpJiioglossum crotalophorides Walt. Houston — Hall. 



OpJiioglossum pusillum Nutt. Several stations in Newton 

 county, /. M. Fcthcrolf. Not before reported from Texas. 



Botrychium Virginianum Sw. Rattlesnake fern. Very rare. 

 In woods Dallas and eastward. 



OSMUNDACEiE. 



Osmunda regalis L. Flowering fern. Common in swamps 

 in the eastern part. 



Osmunda cinnamomca L. Cinnamon EERN. Common in 

 damp places, eastward. 



