_ 472 Evans: THREE SouTH AMERICAN SPECIES OF ASTERELLA 
will at once distinguish the Chilean species, the dorsal air chambers 
being subdivided by supplementary partitions, while those of 
A. tenella and A. Ludwigii remain undivided. The basal portions 
of the ventral scales, moreover, have fewer cells with oil-bodies 
and the appendages are much more slender. The deeply lobed 
female receptacle is also a distinctive feature, the lobes being much 
shorter in A. tenella and scarcely evident in A. Ludwigii. In 
A. venosa, with which the species was compared by Montagne, 
the thallus is far more delicate, the disc of the female receptacle 
is flatter, the spores are smaller, and there is no coarse reticulum 
on the surface. 
2. Asterella macropoda (Spruce) comb. nov. 
Fimbriaria macropoda Spruce, Trans. Bot. Soc. Edinburgh 15: 
564. 1885. 
Fimbriaria canalensis Spruce, l.c. 564. 1885. 
Fimbriaria Mandoni Steph. Bull. Herb. Boissier 7: 207. 1899. 
Thallus green above and sometimes throughout but usually 
with the margin and ventral surface more or less pigmented with 
purple, mostly 2-3 tm. long and 5-8 mm. wide, plane or nearly 
so with undulate and often crispate margins, branching by forking 
and also by apical innovations and intercalary ventral outgrowths, 
keel narrow but rounded: epidermis composed of cells of somewhat 
thickened walls, sometimes with distinct trigones, averaging about 
28 x 24 mu (exceptional cells sometimes 60 u long); pores somewhat 
elevated, measuring (with their surrounding cells) mostly 120-140 u 
in length and 100-120 p in width, surrounded by eight (sometimes 
seven, nine or, rarely, ten) radiating series of cells with four 
(sometimes three or five) cells in each series, radial walls distinctly 
thickened, becoming thinner toward the opening; cells containing 
oil-bodies as as in A. tenella; green tissue loose, the air-chambers in 
three or four layers (in the median portion), those of the dorsal 
layer sparingly subdivided by supplementary partitions and thus 
appearing about as large as the deeper chambers; compact tissue 
occupying about half the thickness of the thallus in the median 
portion, thinning out gradually on the sides but extending scarcely 
more than one-tenth the distance to the margin, composed of 
cells with slightly thickened, pitted walls: mycorrhiza sometimes 
present; ventral scales ovate and long-decurrent, purple through- 
out or with the appendages and margins more or less bleached, 
cells containing oil-bodies mostly eight to twelve, scattered, : 

