FuNARiACE^.] 126 [Nanomitmm. 



3. NANOMITRIUM Lindb. 



Not. ur Sallsk. Fn. et Fl. Fenn. forh. 1874, p. 409. 



Plants very minute, nidulant in persistent protonema. Caps, 

 globose, immersed, cleistocarpous, apiculate or muticous ; calyptra 

 minute, subdisciform, stylidiiferous, closely adherent. Leaves nerve- 

 less, with lax, smooth cells. — Der. vavos dwarf, /jurpiov a calyptra. 



NANOMITRIUM TENERTJM (Bruch) Lindb. 



Synoicous ; protonema less conspicuous. Leaves patulous, broadly 

 ovato-lanceolate, obsoletely denticulate at apex, pale and flaccid. Caps, 

 soft, pale ochraceous, subspherical ; spores less distinctly verrucose. 

 (T. LXIV, C.) 



Syn. — Phascum tenerum Bruch MS. Br. Sch. Bry. eur. Fasc. I, p. 6, n. 2 (1837) Schwaeg. 

 Suppl. IV, t. 302 a. (1842). HoBK. Synops. 27 (1873). 



Ephemerum serratum y. tenerum Hampe Flora xx, P. I, 285 (1837). 



Ephemerum tenerum C. Muell. Bot. Zeit. 1847, p. loi ; Synops. i, 31 (1848). Rabenh. 

 Deutsch, kr. fl. ii, S. 3, 84 (1848). Bry. eur. fasc. 42, p. 4 (1849). Schimp. Synops. 4 

 (i860); 2ed. 4. MiLDE Bry. siles. igo (1869). Jaeg. Ber. St. Gall: gesells. i86g,p. gg. 

 Philib. in Rev. bry. 1878, p. 26. HusN. Mouss. nord-ouest 2 ed. gg {1882), Muse. gall. 

 208, t. 56 (1888). 



Micromitrium megalosporum Austin Muse, appalach. 11, n. 47 (1870). Sulliv. Icones 

 suppl. 20, t. II (1874). 



Nanomitrium tenerum Lindb. in Not. ur Sallsk. 1. c. 



Synoicous ; plants very minute, nidulant in persistent protonema. 

 Leaves broadly ovato-lanceolate, nerveless, obtusely serrate in the 

 upper half, cells lax rhomboid-rectangular. Caps, nearly sessile, 

 leptodermous, globose, immersed, apiculate or muticous, soft and pale ; 

 calyptra very short and small, closely adhering to apex of capsule ; 

 vaginula large, truncate, obovate ; spores slightly verrucose, not large. 



Hab. — On mud removed from a lish-pond at Pond Leigh, Hurstpierpoint 

 [MitUn 1854)! ! Fr. II. 



This remarkable little moss was first found by Breutel, at Niesky, and 

 once only, and Mr. Mitten informs me that he also found it in abundance in 

 the locality mentioned, but he has never met with it since. As a genus it 

 differs from Epkemenim by the flattish cap-like calyptra, and the lax smooth 

 non-incrassate leaf-cells. The name Micromitrium being already adopted 

 by Spruce for a group of Orthotricheaj, Lindberg changed Austin's generic 

 name to the equally appropriate one of Nanomitrium. Three more species 

 are found in America. 



