EXPLANATION OF THE PLATES, 



105 



Fig. 17. Tortula muralis. 

 Wall Screw Moss (a) . 



Colour. Emerald green, with white hairs. 

 Stems. Short, in thick cushions. 



Leaves (b) . Oblong-, the nerve running* into a hair-like point; margins recurved. 

 Flowers and Fruit. Monoicous. Capsule oblong; seta red. Spring. 

 Locality. Abundant upon walls. 



Varieties. Incana. — Shorter and smaller ; hair-points of leaves very long. 

 JEstiva. — Stems more slender ; leaves narrower. 



Pupestris (Fig. 18). — Larger; leaves oblong, darker green, very hoary; 

 capsule long, curved. 



Fig. 19. Tortula marginata. 

 Border-leaved Screw Moss (a) . 



Colour. Yellow green. 



Stems. Short, not branched, gregarious. 



Leaves (b) . Lanceolate, margin thickened ; nerve excurrent. 



Flowers and Fruit. Monoicous. Capsule cylindrical. Summer. 



Locality. On sandstone walls. Rare. 



Fig. 20. Tortula augustata. 

 Upright Screw Moss (a) . 



Colour. Yellow green. 

 Steni,s. Short, gregarious. 

 Leaves (b) . Lanceolate, acute. 



Flowers and Fruit. Monoicous (?) . Capsule cylindrical ; lid subulate. 

 Locality. Near Ringway, Cheshire. Mr. Wilson. 



