6 AMERICAN FERN JOURNAL 
hyaline simple hairs, these few-celled, flattish, and 
somewhat twisted in drying; margins unaltered, the 
narrow line of sporangia almost wholly concealed by 
the dense paleaceous covering of the under surface. 
Type in the United States National Herbarium, No. 
50931, collected from shaded ledges at San José Pass, 
State of San Luis Potosi, Mexico, October 11, 1890, by 
C. G. Pringle (No. 3297); distributed as Notholaena 
Aschenborniana Klotzsch. 
The following additional specimens of N. hyalina are 
in the United States National Herbarium: 
Mexico: A second sheet of the type collection, 
Pringle 3297. Minas de San Rafael, State of San Luis 
Potosi, Purpus 5486 (2 sheets). Puebla, State of Oax- 
aca, Purpus 4018. Las Sedas, State of Oaxaca, alt. 
1800 meters, C. L. Smith 2012. La Palma, Jalisco, 
Jones 533. : 
Notholaena hyalina is related to N. Aschenborniana of 
more northerly range, with which it has been confounded 
on account of its general similarity. Notholaena Aschen- 
borniana, however, is easily distinct, among other 
characters, in its strongly ascending pinnae (the basal 
ones never of a pronounced deltoid form), its simpler 
and closer segments, and particularly in the widely 
different, subintricate hairy covering of the upper side 
of the lamina, the hairs being stellate with spreading, 
subequal, capillary divisions. The contrast to the large 
simple hairs upon the upper side of the lamina of N. 
hyalina is very great. 
Notholaena Aschenborniana is represented in the 
National Herbarium by the following specimens: 
Mexico: San Lorenzo Canyon, 6 miles southeast of 
Saltillo, Coahuila, Edw. Palmer 402, in 1904. Sierra 
Mojada, Coahuila, Jones 531. Santa Eulalia Moun- 
tains, Chihuahua, Wilkinson; Pringle 466, 469. 
Texas: Vicinity of Van Horn, June, 1905, G..H 
Yy. ; 
