158 LICHENS OF THE STATE OF WASHINGTON 



inconspicuous, 1-3 mm. in diameter, sessile; disk concolorous with the 

 thallus, or salmon-color (R), concave to convex; thalline margin dis- 

 appearing; spores hyaline, oblong-ellipsoid to ellipsoid, straight or slightly 

 curved, 1 -septate, 11.5-16.5 x 3.9-5.9 ^n. 



On trees and old wood: San Juan Co. : Brown Island, 1928, 1884 ; San 

 Juan Island, Pt. Caution, 1940, 3271. Clallam Co.: Port Angeles, 1911, 

 Foster 1813 (W) ; Dungeness, 1913, Foster 2536 (F). Wahkiakum Co.: 

 Cathlamet, 1907, Foster 503 (F). Grays Harbor Co.: Montesano, 1919, 

 /. M. Grant (F) ; Westport, 1908, Foster (F). 



Readily determined because of its net-like structure. It has never been 

 collected many miles away from the ocean. Plate X, A, B, C. 



8. Ramalina Roesleri (Hochst.) Nyl. Bull. Soc. Linn, Normand. ser 2, 

 4:165. 1870. 

 Ramalina farinacea var. Roesleri Hochst. in Schaer., Enum. Critic. 



Lich. Eur. 9. 1850. 

 Ramalina pollinariella Nyl. 



Thallus grayish green, Isabella color (R), apricot bufT (R), or tawny- 

 olive (R), small, never more than 5 cm. long, Howe (1914), erect, rigid, 

 tufted, somewhat shiny, much branched irregularly, lobes subterete to flat- 

 tened, tips fine and delicate, branched like a tree, often sorediate, only 

 sterile specimens from the state have been seen by the writer. 



On trees : Pacific Co. : Long Beach, 1940, 2754. 



Apparently a rare species, perhaps overlooked because of its small size. 



62. Usnea (Dill) Adans., Fam. PI. 2:7. 1763. 



Thallus various shades of greenish gray or grayish green, yellowish 

 green or pale yellow, fruticose, erect or pendulous, terete or sometimes 

 angular, stiff, and often thread-like, smooth to often rough scurfy, papillate 

 or sorediate, usually much branched irregularly, often forming entangled 

 mats, horny cortical layer of closely interwoven hyphae completely sur- 

 rounding a thin algal layer and cottony medulla with a central medullary 

 cord of strong thick walled hyphae, no rhizoids, but attached to the sub- 

 stratum by a holdfast. Apothecia circular, terminal or lateral, pedicellate; 

 usually with thalline margin colored like the thallus, more or less entire; 

 hypothecium hyaline; paraphyses agglutinated, branched and septate, asci 

 8-spored, spores hyaline, nonseptate. 



A. Medullary cord treated with IKI, turns blue immediately. 



5. U. longissima 

 A. Medullary cord treated with IKI, no color change. 



B. Thallus rather short, erect, shrub-like, sorediate 4. U. hirta 



B. Thallus longer, more or less pendulous, rarely sorediate. 



C. Cortex lacunose, seamed and ridged, not papillate 1. U. cavernosa 



C. Cortex smooth or papillate. 



