STANDLEY — ^FLOEA OF GLACIER PARK. 265 



Leaves thick, evergreen, the teeth bristle-tipped; indusium round, 

 attached by the center 8. POLYSTICHTJM. 



Leaves thin, not remaining green through the winter, the teeth scarcely 

 or not at all bristle-tipped; indusium kidney-shaped, attached by its 

 base 9. DRYOPTERIS. 



1. POLYPODIUM L. 



1. Polypodium hesperium Maxon. Western polypody. Occasional at low and 

 middle altitudes, on shaded mossy rocks; more common on the east slope. Yukon 

 to Calif., S. Dak., N. Mex., and Ariz. — Rootstocks slender, creeping; leaves 7 to 

 20 cm. long, the lobes blunt, the stalks straw-colored; sori large, rounded, without an 

 indusium, borne on the lower leaf surface. 



The rootstocks are sweet and have the flavor of licorice. 



2. ADIANTUM L. 



1. Adiantum pedatum aleuticum Rupr. Maidenhair. Infrequent; chiefly above 

 timber line, in crevices of cliffs or in soil at the foot of cliffs. Alaska to Calif., Utah, 

 and Mont.; also in Que. — LeaA^es glabrous, composed of niunerous small thin fan- 

 shaped leaflets; leaf stalk very slender, brittle, dark chestnut-brown; sori at first 

 covered by the reflexed lobes of the leaflets. 



In many regions the maidenhair grows in rich woods, but in Glacier Park it is 

 seldom found except upon cliffs. 



3. PTERIDItTM Scop. 



1. Pteridlum aquiliaum pubescens Underw. Bracken. Common and often 

 abundant up to timber line; on open slopes or in dry or moist woods; sometimes in 

 swampy thickets. Alaska to Mex. ^Rootstocks slender, creeping; leafstalks slender, 

 pale, the leaves coarse and firm, somewhat triangular in outline, divided into numer 

 ous narrow pinnules, these entire or lobed . 



One of the most common ferns of the park, often densely covering considerable 

 areas. On the west slope in wet places the plants get to be 1.5 meters high or even 

 larger. In open places the leaves are frequently very pubescent, but in moist woods 

 they are greener and nearly glabrous; in autiunn they turn brown or bright yellow. 

 The young stems were eaten by some of the western Indians. 



4. CRYPTOGRAMMA R. Br. 



Leaves much divided, glabrous, tufted, the sterile and fertile ones unlike, the 

 ertile ones taller and with narrower divisions; sori marginal but extending down along 

 the veins. 



Leaves thin and delicate, the divisions of the sterile ones ovate to fan-shaped; leaf 



stalks brown or brownish below or throughout 1. C. stelleri. 



Leaves firm, the divisions of the sterile ones ovate-oblong; leaf stalks straw-colored. 



2. C. acrostlchoides. 



1. Cryptogramma stelleri (Gmel.) Prantl. Cupfbrake. Occasional in crevices of 

 wet cliffs above timber line; abundant on wet mossy rocks at Baring Falls. Alaska 

 to Lab., Pa., Colo., and Wash.; also in Asia. — Rootstocks slender, creeping; leaves 

 pale green, usually 10 cm. long or shorter, 2 or 3 times divided, the pinnules finely 

 toothed. 



At Baring Falls the plants densely cover the overhanging cliffs in the spray of the 

 falls; at high altitudes they are smaller and poorly developed. They usually have a 

 pale, sickly appearance, and are not at all conspicuous. 



2. Cr3T)togramma acrostichoides R. Br. Parsley fern. Common on cliffs and 

 rock slides at middle and high altitudes. Calif, to N. Mex., Sask., L. Huron, and 



