EXPLANATION OF THE PLATES. 



89 



Plate X. 



POTTIE^E. 



Characteristics of Sub-Order. 

 Plants minute, annual or biennial; tufted, on earth and walls. Capsule ovate, 

 erect or slightly oblique. Monoicous, sometimes synoicous. Leaves nerved ; areolas 

 (Fig. 1. a), oblong-quadrate. 



POTTIA. 



Generic Character (Fig. 1, b, e, d) . 



Capsule (?>) ovate ; peristome none ; lid conical ; beak oblique ; columella (c) 

 with a broad summit, which fills the mouth of the capsule. Spores (d) large. 

 Perichastiuni none. 



Fig. 2. Pottia cavifolia. 



Oval-leaved Pottia (a) . 



Colour. Dull green. 

 Stems. Very short. 



Leaves. Oval, bristle-pointed, with singular appendages like green bags, to 

 the upper side of the nerve, (lamellce) , apparently masses of colouring 

 matter. 



Capside. Ovate ; seta short ; lid oblique. Spring. 

 Locality. Earth. 



Variety. Pottia gracilis, (Fig. 3, a), stems longer; leaves (b) looser (lax); capsule 

 on long pedicel. 



Fig. 4. Pottia minutula. 

 Smallest Pottia (a) . 



Colour. Dull green. 

 Stems. Extremely short. 



