LICHENS OF THE STATE OF WASHINGTON 161 



On trees: Grays Harbor Co.: Lake Quinault, 300 ft., 1931, 1204a. 

 Pacific Co. : Chinook, 1940, 2796, 2835b. Clallam Co. : Sequim, 1915, /. M. 

 Grant (F), this specimen was determined as Usnea ceratina by G. K. Mer- 

 rill. Pierce Co.: Steilacoom, Washington Territory, 1865, Torrey (F). 

 Thurston Co.: Gate, 1911, Foster 1934 (W). Lewis Co.: Mineral, 1905, 

 Flett (F), vidi J. Motyka. 



As the specific name indicates, this is the longest of the Usneas. The 

 blue color reaction of the medulla with IKI is distinctive. Plate XI, B. 



6. Usnea plicata (L.) Wigg. Prim. Fl. Holsat. 91. 1780. 

 Lichen plicatus Linn. Sp. PI. 1154. 1753. 



Usnea dasypoga var. plicata (L.) Cromb., Monogr. Brit. 1 :204. 1894. 

 Usnea barbata var. plicata (L.) Fries Lichenogr. Eur. Reform. 18. 



1831. 

 Lichen barbatus Linn. Sp. PI. 1155. 1753. 



Thallus grayish green or straw yellow (R), elongated and pendulous, 

 terete, main branches coarse at length intertangled, secondary branches 

 irregularly dichotomous, fibrils lacking or sparse and tortuous, cortex 

 rough, somewhat papillate, sometimes broken into rings, rarely exposing 

 the white medulla. Apothecia marginal or subterminal, 1-3 mm. in diam- 

 eter, pedicellate; disk pale flesh color, often turning chestnut-brown (R), 

 concave to plane; thalline margin entire, spores hyaline, ellipsoid, non- 

 septate, 5.0-10.0 X 4.0-8.0 fl. 



On trees and rarely on old wood: Pacific Co.: Loomis Lake, 1940, 

 2840. Kitsap Co.: Hidden Ranch near Bremerton, 213 ft., 1930, 527. 

 Clallam Co.: Port Angeles, 1911, Foster 1811 (F) ; Cape Flattery, A. H. 

 Smith, 1897 (M). 



63. Thamnolia Ach., in Schaer. Enum. Lich. Eur. 243. 1850. 



Thallus fruticose, consisting of erect or prostrate, hollow podetia, with 

 a well-developed plectenchymatous cortex surrounding an algal layer and 

 a thin medulla, hollow center; horizontal thallus lacking. Apothecia not 

 found in America. 



1. Thamnolia vermicularis (Sw.) Schaer. Enum. Critic. Lich. Eur. 243. 

 1850. 

 Lichen vermicularis Sw., Meth. Muscor. 37. 1781. 



Podetia pure white or ashy, erect or prostrate, short or somewhat 

 elongated, sparingly branched, often forked toward the tip, subulate, 

 hollow, terete to slightly flattened, podetia often densely clustered. 



On soil: Pierce Co.: Mt. Rainier, Burroughs Mountain, 7300 ft., 1931, 

 603. San Juan Co.: Orcas Island, Mt. Constitution, 2500 ft., 1928, 2067; 

 1906, Fink 329 (W). Mason Co.: Mt. Elinor, 5500 ft., 1912, Foster 2098 

 (W). Olympic Mountains, 1917, /. M. Grant (F). Pierce Co.: Mt. 

 Rainier, Table Mountain, 8000 ft., 1925, /. M. Grant 409 (F). 



