NMCKEREI. 69 



outer of sixteen teeth, each with a medial line; inner of narrow, 

 keeled processes, connected at the base. Perennial Mosses 

 growing on trees or on stones. 



a. ATonoicous. 



1. N. pennata, Hedw.; secondary stems pinnate, flat; 

 leaves ovato-lanceolate acuminate, nearly entire, nerveless; 

 sporangium ovato-oblong, immersed in the perichsetial leaves. 

 Hook. $ mis. t. xxxiv.; Grev. Scott. Crypt. Fl. t. 109.; 

 (Plate 4, fig. 4) ; Movg. % Nest. n. 146. 



On trunks of trees in subalpine districts. Found once only 

 in Scotland, and once in Ireland. Bearing fruit in spring. 



Stems 2 inches or more long, creeping, branched; the 

 branches erect, pinnate, sometimes simple, often much attenu- 

 ated at the tip; leaves flat, the outer ones spreading, ovate 

 or ovato-lanceolate, concave at the base, slightly undulated, of 

 a pale green, shining, very minutely serrate towards the tip 

 or quite entire, nerveless or occasionally with two faint nerves 

 at the base ; cells elongated ; perichsetial leaves in which the 

 sporangium is immersed more elongated; sporangium ovato- 

 oblong ; lid shorter, oblique, rostrate ; veil whitish, hood- 

 shaped ; peristome nearly colourless ; outer teeth lanceolate, 

 inner filiform, extremely delicate, short, and fugacious, often 

 more or less attached to the outer. 



Differs from the other British species in its monoicous in- 

 florescence, and immersed sporangia. It is very widely diffused, 

 and occurs in the southern as well as the northern hemisphere. 

 The fruit is perfect in early spring. A closely allied species, 

 N. oliyophylla, occurs in the north of Europe and Canada, 

 which is distinguished by its minute, subglobose sporangia, 

 shorter, less pinnate, often simple branches, very rugged, 

 narrower, and suddenly acuminate, less crowded leaves, which 



