EXPLANATION OF THE PLATES. 179 



Plate XXVIII. 



FILICOIDEI. 



Mosses with leaves, in two rows, flat on each side of the stem. (Figs. 1 b^2 b) . 



Fig. 1. SCHISTOSTEGA PENNATA. 



Cavern Moss (a) . 



Colour. Emerald green. 



Stems. Very short, in dense patches; annual, from a perennial thallus (see 



Discelium) . 

 Leaves (&) . Two ranked, oval-rhomboid, joined together at their bases ; the 



lower thread-like ; areolae very large ; plant not hygroscopic. 

 Flowers and Fruit. Dioicous ; capsule (c) very small, round, erect, mouth wide ; 



peristome none, lid convex. Spring. 

 Locality. Moist banks and caverns. 



PISSIDENTE^. 



Fig. 2. Chakacteeistics of Oedeb. 



Plants small, in patches ; capsule on long slender seta, various, lid beaked ; 

 peristome (a) of sixteen deep red teeth, divided more than half way, with m.any 

 bars, strongly hygroscopic. Leaves two ranked, flat on each side of the stem 

 (bifarious) . (See Dicranum) . 



I. Fruit Terminal. 



Fig. 3. Fissidens exilis. 



Slender Flat Moss (a) . 



Colour. Dark green. 

 Stem,s. Very short. 



