216 Howe AND UNDERWOOD: THE GENUS RIELLA 
described and figured. References to the principal literature deal- 
ing with the genus, together with the names and distribution of 
the species hitherto described, are given below: 
Rieitta Mont. Ann. Sci. Nat. IJ. 18: 11. 1852. Leitgeb, Un- 
tersuch. Leberm. 4: 74-87. p/.7, 8. f.r7-8. 1879. Trabut, 
Rev. Gén. Bot. 3: 449. 1891. Goebel, Flora, '77: 104- 
108. pl. 2. f. 1-3. 1893. Schiffn.; E. & P. Nat. Pflanzen- 
fam.°1*°: 51. 1893. Stephani, Bull. Herb. Boiss, 7: 
658. 1899. 
Duriaea Bory & Mont. Compt. Rend. Hebd. Acad. Sci. 16: 
Ere. nas nn oa. Nat, I 3 328) 1844. GL. & 
N. Syn. Hep. 593. 1846. Not Duriewa Mérat, Mém. 
Soc. Roy. Sci. Lille, 1827-28: 432. 1829. Not Duri- 
cua Boiss. & Reut. Diag. Pl. Nov. Hisp. 14. 1842. 
Maisonneuvea Trevis.* Mem. R. Ist. Lomb. III. 4: 442. 1877. 
Duriella Clauson & Billot, fide Schiffn., Zc. 
RIELLA BATTANDIERI Trab. Rev. Bryol. 13: 35. p/. 37. 1886. 
Schiffn. Bot. Centralb. 27: 240. pl. z.f. 5. 1886. 
ALGERIA: Maison-Blanche near Algiers, Lattandier, Trabut. 
Exsicc.: Husnot, Hep. Gall. no. 173. 
Forma Gattica (Bal.) Corbiere, Rev. Bryol. 29: 113. 1902. 
Riella Gallica Bal.; Trab. Rev. Gén. Bot. 3: 450. pl. 78. fF. 
G.. 3801: 
FRANCE: Roquehaute, near Béziers, Hérault, Be/ansa, 1866, 
Crozals, 1902; mare de Rigaud near Agde, Hérault, Croz- 
als, 1902. 
RIELLA CossontAna Trab.; Batt. & Trab. Atlas Fl. Alg. 1: 6. fi. 
2. f. 1-8. 1886; Rev. Bryol. 14: 12. p/. 1887. 
ALGERIA}: El Kreider, Province Oran, Cosson, 1854; Tra- 
but, 1885. 
Exsicc.: Husnot, Hep. Gall. no. 174. 
* Trevisan rejected “ie//a Mont. on account of Aze//a Raf.; Lév.; Orb. Dict. 
Univ. Hist. Nat. 8: 488. 1849. This, however, is a nomen nudum and is probably 
a misprint for Rimel/a Raf. Jour. Phys. 89: 106. 1819. 
+ Allusions to the occurrence of Rie//a Cossoniana in the Canaries have recently ap- 
peared in print (Bot. Tidsskrift, 24: 327. 1902; Rev. Bryol. 29: 110. 1902), but 
it is possible that these refer to Rie//a affinis, described below as new. 
