TR1CHOSTOMEI. 251 



points, keeled ; margin recurveo ; sporangium elongated, some- 

 what incurved ; lid as long as the sporangium. Hook, fy Wils. 

 t. xii. ; Eng. Bot. t. 2070. ; (Plate 22, fig. 4) ; Moug. % Nest, 

 n. 26. 



On walls, thatched roofs, banks, etc. Very common. Bear- 

 ing fruit in eaiiy spring. 



Forming large, loose, green cushions or patches, hoary with 

 the hair-points of the leaves, 1-3 inches high. Leaf-cells 

 small and very compact above, very loose, diaphanous and 

 rectangular below ; ring of a double row of cells ; the tube is 

 tessellated, composed of rectangular cells, forming regular 

 courses, and the free threads which consist of two distinct 

 parts, a narrow, darker, and a broader light portion are imme- 

 diately derived from the cells, the darker part arising from the 

 walls, the lighter from the contained sac. 



4. T. intermedia, Brid. ; stems densely tufted ; subpul- 

 vinate; leaves erecto-patent, upper ones somewhat incurved, 

 very obtuse, with a very rough hair-point ; sporangium shorter 

 on a shorter fruitstalk. Syntrichia intermedia, Brid. Bryol. 

 Eur. 



On rocks. Near Conway ; Malham, Yorkshire, W. Wilson. 

 Bearing fruit in spring. 



Leaves slightly twisted. Distinguished from Tortula ruralis 

 by its extremely obtuse, flat, erect leaves, and other points. 



5. T. latifolia, Bruch ; upper leaves rosulate, spathulato- 

 lingulate ; nerve ending at the obtuse emarginate apex or 

 slightly excurrent; margin nearly plane; sporangium long, 

 subcylindrical ; lid shortly rostrate; ring simple. Hook, fy 

 Wils. t. xliii.; (Moug. % Nest. n. 921.) 



On trees, etc. From Scotland to Essex. Bearing fruit, 

 but very rarely in summer. 



Forming loose, dark, lurid-green patches. Leaves very 



