PORELLA 163 
Сайоп, Mt. Diablo (1195, 1196, 1218); Ukiah (756), Pieta (797), 
Mendocino Со.; near Hay Fork (1108), Trinity Co.; Oak Run and 
Cow Creek, Shasta Co. (M. S. Baker and F. P. Nutting); Nord- 
hoff, Ventura Co. (Miss Jacqueline K. Newton); Pasadena and 
Elsinore (A. J. McClatchie). 
Type in herb. Pearson, Knutsford, Cheshire, England. We 
have seen no specimens of Porella Bolanderi from any station out- 
side of California. Can. Нер. по. то (distributed as P. Bolanderi) 
is, so far as we have seen it, Porella rivularis—in one pocket 
mixed with P. navicularis. Can. Нер. no. 11 (issued as Porella 
Bolandert var.), from Mt. Benson, Vancouver Island, is Poredla 
Roellit Stephani. 
Іш moist, densely shaded places, Pore//a Bolauder? assumes а 
more lax, flaccid habit, resembling certain forms of P, rivularis, 
Such conditions, however, when the characteristic ciliate perianths 
are wanting, can usually be distinguished from any state of P. 
rivularis by the more oblong, more distinctly marginate, dorsal 
leaf-lobes, and by the longer and narrower ventral lobes and un- 
derleaves, which are more pronouncedly caudate at the base. 
PLATES ІІІ and 112. PoRELLA BOLANDERI. 
1-3. Plants, = T гаи size. 
lant, 4, ral size. 
Portio Ср де ventral view, Х 12. 
Mature perianth and part of stem, ventral view, >< 12 
erianth, bracteole, bracts, etc., ventral view, Х 12. 
Half of set of young perianth, Х 53. 
g and 10. Transverse sections of perianth, the lower side ventral, 23. 
11-13. Cauline leaves, showing the ventral lobe, Х 2 
14. Leaf and ventral lobe, Х 12 
15-17. Leaves, dorsal view, Х 12. 
18 and 19. Underleaves, Х 23. 
20. Leaf-cells, 
Figs. 1 and 2 fice на collected in Fruit Vale by Miss Byxbee ; 3, 5, 14, 
16, 17, and 20, from no. 1190 (Berkeley); 4, from no. 1189 (Berkeley) ; 6 and 12, 
from no. 1196 (Mt. Diablo); pim 13, 15, and I9, from no. 7 (Berkeley) ; 11 and 18, 
from no. 1195 (Mt. Diablo). 
pret 
2. PoRELLA RIVULARIS (Nees) Trevis. Mem. r. Ist. Lomb. III. 4: 
407. 1877. 
Madotheca rivularis Nees, Naturgesch. Eur. Leberm. 3: 196. 
1838. 
