FOSSOMBRONIA. 421 



rather smaller size, its only slightly fetid smell, paler colour of 

 stem, which on a cross-section is semicircular, antical surface 

 slightl}^ channelled, postical convex, rootlets not so deep purple in 

 colour, and the dark densely cristate spores, the crests projecting 

 beyond the margin appear like minute spines, and number from 

 28 to 36 round. (See interesting note in " Journ. of Bot." 

 Oct. 1900, by Mr. Macvicar.) 



Description of Plate CLXXXIV. — Fig. 1. Plants natural 

 size. 2. Fertile plant x 15 (Schiffner, Engl, und Prantl. 

 Pfl.). 3-6. Cross-sections of stem x 24 (Helsingfors, Lindb.). 

 7, 8. Leaves x 24 (ditto). 9, 10. Ditto x 24 (Herb. Glasgow). 

 11. Leaf X 31 (Ashdown, Davies). 12. Portion of leaf x 

 290 (Herb. Glasgow). 13. Bract x 31 (Ashdown, Davies). 

 14. Calyptra x 31 (ditto). 15. Spore x 290 (Helsingfors, 

 Lindb.). 16. Ditto x ? (Corbiere). 17. Ditto x 204 (Herb. 

 Glasgow). 18. Ditto x 400 (Lindb.). 



(B.) Spores with lamell:^ regularly reticulated, 

 c. Margin appearing as if winged. 



3. rossombronia angulosa (Mich., Dicks.), Badd. 



Jungermania foliis latiusculis, ohtusis, iindulatis et veluti anguhsis, Mich. Nov. 



pi. gen. p. 7, n, 1, pp. e loco et excl. planta juvenili (1729). 

 Jungermania angulosa, Dicks. Fasc. pi. crypt. Brit. i. 7 (1785). 

 Jungermania jntsilla, Sm. Engl. Bot. xxv. n. 1775, pp. (1807). 

 Fossomhronia angulosa, Radd. in Att. soc. sc. Modena, xviii. p. 40, excl. synon. 



Roth et var. B (1818). 



Dioicous, shallowly c?espitose, inodorous, small, of a translucent 

 green colour. Stems procumbent, simple or once furcate, broad, 

 above green, below purple, usually frontally compressed, twice as 

 broad as thick, 12x6 cells, the upper layers composed of some- 

 what large hyaline cells, the lower smaller and purple; or sub- 

 terete, plane above and rotund below, more equal ; radiculose, 

 rootlets violet-purple, very numerous, close, flat, ribbon-like. 

 Leaves horizontal, decurrent, subquadrate or oblong-quadrate, 

 irregularly and obtusely lobed, lobes undulate ; texture delicate, 

 cells rather large, subquadrate, walls thick, angles slightly 



