— 47 — 



flated and then only at the fold at the lower edge of the leaf. The free margin 

 is pressed close to the main lobe of the leaf. The genus has no underleaves. 



Most of the species are dioicous. In these the antheridia are in androecia 

 having the form of catkins and are found at the end of the stem or the 

 principal branches. The archegonia occur in similar positions. The calyp- 

 tra is somewhat pear-shaped, whitish, and nearly opaque. In most spe- 

 cies the perianth is strongly compressed from above, as though it had 

 been "flattened" by a heavy weight. This " dorso-ventrally" flattened 

 perianth occiirs in but one other genus of Northeastern America, Scap- 

 ania. This is easily distinguished from Radula by its bilobed leaves, 

 which have the lower lobe larger than the upper. The lips of the perianth 

 are truncate and nearly or quite entire. The spores are rather large and 

 have a granular surface. 



Radula complanata (L.) Dumort. Comm. Bot. 112. 1822. (Jungerman- 

 nia complanata L. Sp. PI. 1133. 1753-) 



This is the common species of the Eastern United States and is found 

 also on the Pacific slope, but not so abundantly. 



It occurs as yellowish green, depressed mats at the base, or on the lower 

 part of the trunks of trees. Where the plants have not yet formed these 

 mats, they cling closely to the substratum. This species is also found on 

 rocks in the Eastern region of the United States. The leaves are closely im- 

 bricate, and sometimes bear gemmae upon the margins. The upper (dorsal) 

 lobe is nearly round, and the lower (ventral) lobe is rather quadrate, and 

 about a quarter the size of the dorsal. The walls of the leaf cells are thick- 

 ened at the angles. 



The species is paroicous, the perianth long-obconic, strongly com- 

 pressed, two lipped, entire or nearly so. The capsule is ellipsoidal or obo- 

 void, exserted from the perianth only a short distance. 



Sayre, Pa. 



(To be continued.) 



NEW OR UNRECORDED MOSSES OF NORTH AMERICA. 



By J. Cardot and I. Theriot. 

 Condensed from Bot. Gaz. 30, July, 1900. Translated by Miss Warner. 

 Pterogonium gracile Sw. var. Californicum Ren. & Card. 



Differs from the typical European form in the longer and more acumin- 

 ate leaves and in the smaller alar cells. 



California: " Ad rupes Californise, perfrequens ; Bolander" (Sulliv. & 

 Lesq. Musci Bor. Amer, Exsicc, ed. 2, no. 349); Sansalito (Marshall A. 

 Howe, 1892;) Coast Range Mts., San Mateo Co., on trees (M. A. Howe 

 1895; Ren. & Card., Musci Amer. Sept. exsicc. no. 316). All the Californian 

 specimens of P. gracile that we have examined belong to this variety. 

 Pylaisia polyantha Sch. var. drepanioides Ren, & Card. 



A peculiar form, similar in habit and size to Hypnuvi pallesce7is . The 

 secund leaves usually faintly toothed to the base of the acumen, the al 



