REBOULIA 39 
in the Sullivant collection, was apparently the first to recognize 
that the name was a synonym for Clevea hyalina, as is attested by 
a pencil inscription in Austin’s handwriting on the pocket contain- 
ing the original specimen, now in the herbarium of Harvard Uni- 
versity. Тһе several plants since collected іп the mountainous 
regions of the western United States and British America, and 
identified with this species of Sullivant’s, though quite variable, 
cannot, we think, be satisfactorily distinguished from the Clevea 
hyalina of Europe. The spores, however, often incline more to 
red, and the thallus is sometimes proportionally broader. 
Of true Зашета, we have seen the following three American 
specimens, probably all referable to Sauteria alpina (Nees & Bisch.) 
Nees: “ under rocks, Sulphur Mts., Banff, J. Macoun, 16 July, 
1801, no. 345 ;" '* under rocks, Lake Agnes, 7000 ft., J. Macoun, 
I9 Aug., 1891, no. 364”; St. Paul Islands, Pribiloff Group, Beh- 
ring Sea, 1897 (Mr. Trevor Kincaid). 
4. REBOULIA Када! (as Кедои а) Opusc. scientif. di Bologna, 
4: Te ISI" 
Asterella Pal. de Beauv. 2. р. Encyc. Meth. Bot. Suppl. І: 
502. 1810. 
Thallus coriaceous and rigid, dichotomous, usually, also, inno- 
vating at the apex, broadly costate, scale-bearing and dark-purple 
or brownish beneath, the dorsal surface without evident areolation, 
provided with small scattered simple stomata, epidermal cells with 
trigones: chlorophyll-bearing layer strongly developed, passing 
gradually into the colorless stratum, the latter limited to the region 
of the costa, cells with oil-bodies occurring here and there in both, 
air-chambers at first simple, their limits afterwards obscured by 
more or less numerous secondary walls; root-hairs numerous, 
colorless. Gemmae none. Androecium sessile or somewhat 
sunken, in the median line of the thallus, disciform, suborbicular or 
with a lunate sinus in front, often surrounded by a few narrow 
scales. © receptacle conical or hemispherical, becoming at times 
nearly plane above, paleaceous-barbate beneath, containing аіг- 
chambers and furnished with dolioform stomata, cleft about to the 
middle into 1—6 (commonly 4 or 5) thick, often spreading lobes, 
the membranous ventral margins of these forming the conchoid- 
bivalved involucres, each of the latter enclosing a single sporo- 
* This citation is as given by authors Ме have been unable to see the original 
, Paper. 
