— u loo — 

 Riccia radicosa, n. sp., Pkaks. (Fig. XIII). 



Dioicumr Magoitudo minuta; color j^laucuviridis; radiatum. 



Thallus irilurcalus, linealus, poslea canaliculalus, ad apicem sulcatus; faciès posterior 

 convexa, iiiarno asceiidens. recurvaia, liinbo arcto delicaio-undulato-hyalina, circundata 

 sub quu exiani squaini subquadrati atnipuipurei. 



Seclio Iransversalis : densitas '/, ampliludinis; cellula; 60X20; cellulrc corticales, 

 posterior t-l niarginalt-s, obscuro colorata' cuiii textura firnia. Kadicuhi' lenu;H, perdeiisii'. 



Sporae airorubro-fuscac, subni};rae, faciès sphaerica, papillosa, papillae rotundae, 

 Areolae superticiei 6-7. 



Dioicous? Sinall; j:(lauco'.is green in coloiir; radiale. Froncis trifurcate, 

 linear, terminiil ob-ovate; antical surface near base plane, afterwards cani- 

 liculate or bi-canaliculate, near apex suicate; postical convex, niargin 

 ascending, rccurvcd, frinijed with a délicate tliiu, wavy hyaline niargin, 

 below wiiich are sul) quadiate, distant, dark purple scales; cross-section 

 3 times hroader tiian tliick, 60 by 20 cells; postical and marginal cortical 

 cellsofa firm texture and dark coluured; rhizoids thin, densely abundant. 

 Spores dark reddish brown to black; sphaerical face pai)illôse, papilkc 

 roundish, 6 to 7 areolaj across surface. 



Dimensions : Fronds 15. mm. long; 1.5 mm. wide x .5 mm. thick; spores 

 .9 mm. I. mm. x .85 mm; rhizoids .0175 mm. thick. 



Hab. : Mpie, Sept, igio (R. P. H. Vanderlist). 



Obs. : The most striking characters of this species are the sub-quadrate, 

 dark purple scales which are not imbricate as in H. nigrella, D. C, but are 

 remote; the firm dark coloured cortical cells of the postical and marginal 

 sides, and the extraordinary abundance of the délicate rhizoids. 



R. congoaiia, St , is described with spores .75 mm , papilhc acuminate; 

 R. ango/erisis, ST., with fronds 5. tôt 6. mm. long, shortly furcate, antical 

 surface almost plane; 6 times broader than thick. 



Riccia Rautanenii, St. 



Green, fronds linear, 15. mm. long x i. mm. wide, twiceas broadashigh, 

 vesiculose, large cells, antical laver of cells dften broken; spores dark reddish 

 brown, almost black, .075 mm , niargin minutely jiapillose, about 60 pajiilla; 

 along the ridge; rhizoids papillose, délicate, very abundant. 



Hab. : Mpie, Sept. içioiK. P. H. Vandersut). 



Ricciocarpus natans (L.) Corda, var. terrestris. 



Hab. : Mpie, September, igioiR. P. H. V'anderust;. 



Obs. : According to Stephaki (Sp. Hep., p. 55) this species had not been 

 recorded from Africa. In the Manchester Muséum there are spécimens 

 collected by Kkause, at Port Xatal, in 1840. 



I hâve to thank Mr. Naveai: for the pleasure of having the oppor- 

 tunity of examining this small but \erv interesting collection of 

 AfricanHepatics,also for the trouble he and the Rev.Ot:'iRiN,Q. C, 

 hâve taken to give a description in Latin of my new species. 



