268 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Cotorapo: Foothills 5 miles west of Fort Collins, 1896, Baker (U. S8.); 
Boulder, Bethel 4 (Y.); near Tolland, Young (Y.). The second and third 
specimens have been listed by the writer, as A. gracilis, in Bryologist 18: 45. 
1915. 
Uran: Headwaters of Little Cottonwood Creek, above Alta, 1905, Rydberg 
6869a (N. Y.) ; Big Cottonwood Canyon, above Silver Lake Post Office, Garrett 
(N. Y., Y.). 
WASHINGTON : Yakima region, 1882, 7’. S. Brandegee (N. Y.; listed by Under- 
wood, as A. gracilis, in Bot. Gaz, 20: 62. 1895); Tacoma, Flett (Y.) ; Mount 
Rainier, Piper 93 (N. Y.), Flett (Y.) ; Queets River Valley, Olympic Mountains, 
Frye 53 (Y.); bluffs near Cathlamet, Foster 513 (C. C. H., Y.; listed, as A. 
gracilis, by Miss Haynes in Bryologist 12: 65. 1909) ; Gate, Pierce County, 
Foster (C. C. H., N. Y., U. S., Y.; distributed by Miss Haynes in Amer, Hep., 
no. 106, as A. gracilis). 
OREGON: Snow line, Mount Adams, 1894, Lloyd (N. Y.), 
CALIFORNIA: Near Mineral Spring, Tulare County, Coville € Funston 1420,. 
1510 (N. Y., U. 8.; listed by Coville, as F’, bolanderi, in Contr. U. S. Nat. Herb. 
4: 230. 1893; also by Underwood, as A. gracilis, in Bot. Gaz. 20: 62. 1895). 
FINLAND: Lojo, Skraddarla, 1878, Lindberg (C.). 
SWEDEN: Gottsund, Upsala, Myrin (N. Y.); Jénképing, Sméland, Arneill (C. C. 
H., Y.; distributed by Husnot, as A. pilosa, in Hep. Gall., no. 170). 
Norway: Dovres Kongswold, 1854, Zetterstédt (N. Y.) ; Tjéme, Bryhn’ (Y.) ¢ 
Opdal, Vangohen, Hagen (C. GC. H.). 
GERMANY: Near Charlottenbrunn, Weisseritztal, Silesia, 1860, Milde (N. Y..,. 
Y.; distributed by Gottsche & Rabenhorst, as F. pilosa, in Hep. Eur,, no. 161). 
SWITZERLAND: Locality not stated, 1806, Schleicher (N. Y.; labeled Mar-. 
chantia polycephala). 
Iraty: Mont-Cenis, date and collector’s name wanting (N. Y.); Valsesia,. 
Carestia (N. Y.; distributed in Erb. Critt. Ital., IT., no, 956, as I’, pilosa). 
Among the species which certain writers have confused with A. tenella a 
prominent place is held by A. ludwigii. Apparently the first to fall into this. 
error was the Danish botanist Zoéga,* who recorded Marchantia tenella some- 
what doubtfully from Iceland. His example was soon followed by the Swedish 
botanist Retzius, who listed the species from Scandinavia, at first doubtfully * 
and then positively, as indicated in the synonymy. Af, tenella was afterwards. 
included in a number of floristic works by other early writers, especially in 
Sweden and Germany, but all these records, so far as known, were based on A, 
ludwigit. 
Early in the nineteenth century Schleicher discovered the species in Switzer- 
land and distributed specimens under the name Marchantia polycephala. Un- 
fortunately he failed to establish this name by adequate publication. A few 
years later Wahlenberg found the plant in the parish of Folden in northern 
Norway. He recognized the fact that it was the same as the M. tenella of 
Zoéga and Retzius but he made the error of confusing it with Marchantia pilosa 
Hornem.,? now known as Neesiella pilosa (Hornem.) Schiffn. Of course this 
makes the name M. pilosa Wahl. a mere homonym of M. pilosa Hornem. and 
therefore without nomenclatorial standing; but certain later writers have at- 
tempted to maintain the validity of both names, citing the present species as. 
Asterella pilosa (Wahl.) Trevis. or Fimbriaria pilosa (Wahl) Tayl. 
*In Olafsen & Povelsens, Reise igiennem Island, Tilhang 14, 1772. 
* FI. Scand. Prodr. 222. 1779. 
* HI. Dan. pl. 1426. 1810, 
