PilCCIELLA. 495 



subulate hyaline cilia, a little swollen at tlie base ; texture some- 

 what delicate; epidermic cells punctate; radiculose, rootlets 

 numerous, filiform, papillose within. Capsule embedded in the 

 frond, globose, black; spores dark brown, almost black, tuber- 

 culate, spines blunt. 



Dimensions. — Plants forming circular patches | to -J inch in 

 diameter; lobes 3* mm. to 4" mm. long x 7 mm., "8 mm. and 

 r mm. broad; cilia '075 mm. to 'I'lb mm. long x •01 mm. broad 

 at the base, spores "09 mm. diam. 



Oi?s. — Distinguished from any of the other ciliate lUccioi by its 

 green colour on the postical as well as antical surface of the 

 fronds, and the numerous long cilia. 



Hab. — In damp places by ditch sides or on clayey fields. 



Yery rare. 



1. On mud, Tavistock, Devon, ./. Ihilfn ^' //'. Ciirnow, July 

 1875. 



Found on the Continent and in North America. 



Description op Plate CCXXIII. — Fig. 1. Plants natural 

 size. 2. Plant x . 3. Portion of lobe x . 4. Cross-section of 

 lobe X . (). Cilia x (Lindenberg). 



Genus 54. RICCIELLA, Br 



am/. 



Lichenastrum aquaticuvi, Dill. Hist. muse. p. .")14, t. 7i, f. 47 (1741). 

 Hiccia, Linn. Sp. pi. IGOO (175;',). 

 Ricciella, Braun, Bot. Zeit. p. 7:)(; (1S21). 



Plants slender, linear, usually several times dichotomous, 

 scales not present. Fruit globose, exserted, adnate to the postical 

 surface of the frond. 



Ricciella fiuitans (/.), Bra/n/. 



Lichenastrum aquaticinti, Dill. Hist. muse. p. 514, t. 74, f. 47 (1741). 

 Ricciajiuitans, Linn. Sp. pi. 1(50(5 (1753). 

 Ricciella fiuitans, Braun, Bot. Zeit. p. 754 (1821). 



Dioicous, ca?spitose or spreading, not forming rosettes, medium 

 size, yellowish-green in colour. Fronds dichotomously branched, 

 segments narrow, linear, plane or slightly canaliculate, thin, con- 



