44 APLOPERISTOMI. ^Polytrichum. 



Stems from one to two inches high, leaves of a thin and 

 delicate structure, (unlike those of the rest of the genus), 

 crisped when dry. A very remarkable variety of this plant 

 has been found by Mr. Templeton in the Dargle near Dublin, 

 with fruitstalks scarcely two lines in length, and the back of the 

 leaf furnished with evident denticulations, which latter cir- 

 cumstance is not confined to this variety, and has been observed 

 by Bridel. The winged nerve we do not remember to have 

 seen previously noticed, it is a narrow foliaceous appendage 

 running along each side of the nerve. Something of this kind 

 may indeed be remarked on the nerves of all the Polytricha, 

 (as may be seen by our figures), that is to say, they are 

 famished, in a more or less degree, with lamellae, which in P. 

 Icevigatum of Wahlenberg are so prominent as almost to resem- 

 ble the leaves of a book ; in the following species, P. hercyni- 

 cum, they are less evident, and in most of the larger species 

 give the nerve a striated appearance. 



2. P. hercynicum; leaves lanceolate rigid entire their sides in- 



volute, their nerve broad impressed with furrows, capsule 

 oblong suberect, lid conical. (TAB. X.) 



Polytrichum hercynicum. Hedw. St. Cr. v. 1. t. 15. Smith, FL 

 Brit. p. 1381. Engl Bot. t. 1209. Schwaegr. Suppl v. 1. p. 329. 

 Funck, Deutschl. Moose, t. 57. n. 17. Drummond, Muse. Scot. v. 2. n. 

 21. Hook. Fl. Scot. P. II. p. 125. Am. Disp. Muse. p. 72. 



Catharinea hercynica. Ehrh. Moug. et Nestl. n. 725. 



Orthotrichum hercynicum. Hoffm. 



Atrichum hercynicum. P. de Beauv. 



HAB. On mountains at a considerable elevation. 

 Stems short. Leaves, as it were, intermediate in texture be- 

 tween those of P. undulatum and the rest of the Polytricha. 



* * Calyptra covered with succulent filaments. 

 f Leaves entire ; their margins involute. 



3. P. piliferum ; leaves lanceolate-subulate their margins involute 



entire terminating in a pellucid hair-like point, capsule ovate 

 obtusely quadrangular furnished with an apophysis, lid coni- 

 cal. (TAB. X.) 



Polytrichum piliferum. Schreb. FL Lips. p. 74. Menzies in Linn, 



