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y.—On Bog Mosses. By R. Braithwaite, M.D., F.L.S. 



Part IV. 



Plate XIX. 



Group B, Subsecunda, — Plants soft, laxly tufted, commonly 

 growing with other species. Branches terete, their leaves erecto- 

 patent or somewhat imbricated, usually subsecund, broadly ovate, 

 truncate at apex, canaliculate-concave, the edges involute in the 

 upper half, broadly margined. Dioicous. 



2. Sph. tenellum Ehrhart. 



Herbar. Petropol. (1795) teste Lindberg. 



Plate XIX. 



Byn.—S2)h. tenelhm Persoon MS. Bridel, Mantissa p. 1 (1810). Bryol. Univ. I, 

 p. 4 (1826). Liudb. Torfm. No. 13 (18G2). Hartra. Skand. Fl. ed. 9, II. p. 83 

 (1864). — Non Sph. tenellum of Bryol. Germ, nor of Funck, Taschenb. — !^ijh. cym- 

 bi folium /3 tenellum Bridel, Muse. rec. II, p. 24 (1798). — Sph. ubtmifolinm j8 tenellum 

 Weber & Mobr, Bot. Tascb. p. 72 (1807).— syi. mollicscum Bruch, Eegensb. Fl. 

 1825, p. 633. Bridel, Bryol. Univ. I, p. 753 (1826). C. Miiller, Synop. Muse. I, 

 p. 95 (1849). Wilson, Bry. Brit. p. 19, T. LX (1855). Hartm. Skand. Fl. ed. 6, 

 p. 435 (1854). Scbimper, Torf. p. 71, T. 21 (1858). Syuop. p. 682 (1860). 

 Berkeley, Handbook, p. 306, PI. 2, fig. 3 (1863). 



Dioicous. Plants delicate, extremely fragile, 2-6 inches high, 

 but attaining a foot or more when floating, densely clustered in soft 

 tufts of a imle greenish yellow colour. Stem simple or bipartite, 

 straw coloured, covered with a double non-porose cortical layer. 

 Eamuli abbreviated, single, binate or ternate, either all patulous or 

 1-2 deflexed, pale red, lax-leaved, not pointed; cortical cells very 

 unequal, smallest quadrate, largest fiash-sliaped, numerous, ivith 

 the apex recurved and projecting, perforated, yellowish at the 

 moidh. Cauline leaves erecto-patent, reflexed, rather large, ovate- 

 oblong, slightly narrowed toward the apex, margin incurved, with 

 a broadish border, hyaline cells densely fibrose, sparingly porose, 

 but toward the base free from both threads and pores. 



Eamuline leaves patent or laxly incumbent, sometimes secund, 



EXPLANATION OF PLATE XIX. 



Sijhagnum tenellum. 



a. — Female plant, a S . — Male plant. 



1. — Part of stem witb a brancli fascicle. 



2. — Catkin of male fiowers. 2 h. Bract from same. 



3. — Fruit with its peduncle. 4. — Peduncular leaf. 



5. — Stem leaves. 5'ia. — Areolation of apex of same. 5nb. — Ditto of base. 



6. — Leaves from middle of a divergent branch, (jx. — Transverse .section. Gp. — 



Point of same. 6 a a. — Areolation of upper part. 6 c. — Single cell from 



middle x 200. 

 7. — Intermediate leaves from base of a divergent brancli. 

 9 X . — Part of section of stem. 10. — Branch denuded of leaves. 10 x . — Section 



of ditto. 



