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DODGE-<strong>LICHEN</strong>8 <strong>AND</strong> <strong>LICHEN</strong> PARASITE8 197<br />
Medulla very loosely woven throughout<br />
Cortex very thin, 20-3OP<br />
Plants erect, rigid, medulla about 2.5 times as thick as cortex . . U. frigida<br />
Plants decumbent, very soft, medulla about six times as thick as the cortex U. lazissilita<br />
Cortex about 100p thick<br />
Fertile, disc zinc orauge to tawny, medulla about four times as thick as the cortex<br />
U. trachycarpa<br />
Sorediose, somdia tuberculate, medulla about twice as thick as the cortex; Arctic<br />
U. dphurea<br />
Medulla somewhat 1 sel woven, cortex papillate<br />
YY<br />
Rugose plicate, 7-8 cm. tall . . . . . . . . . . U. strigulosa<br />
Papillae hemispheric, 3 em. tall . . . . . . . . U. aurantiaca<br />
,--<br />
Medulla dense in the outer half, hose next the the axis, with large air-spaces; sorediose; cortex<br />
60-7Op ; axis 400-450p<br />
Surface smooth or nearly so, soredia plane to deeply eroded; medulla 80-100p<br />
U. antarctica<br />
Surface foveolate, soredia tuberculate; medulla 190p . . . . U. subfoveolata<br />
Medulla uniformly densely woven<br />
Medulla very thin, much thinner than the cortex<br />
Medulla about one-tenth as thick as the cortex . . . . . . U. aurantkeo-atra<br />
Medulla about one-half as thick as the cortex; sorediate . . . . U. pustulata<br />
Nedulla equal to the cortex or slightly thicker, not twice as thick<br />
Fertile . . . . . . . . . . . . . . U. fasciata<br />
Sorediose<br />
Not papillate, cortex cracked annularly, cracks blackening, with some longitudinal<br />
,/ cracks . . . . ,. . . . . . . . U. acromelana<br />
Surface papillate<br />
Secondary branches closely papillate with large soralia, only a few small soralia<br />
on the ultimate branches . . . . . . . . U. scabrirlulus<br />
Secondary branches slightly rugose and subfoveolate with scattered papillae<br />
above, soralia small, convex, confined to the ultimate branches U. subpapillata<br />
Medulla much thicker than the cortex (more than twice as thick)<br />
Axis very thick, about 1,000p<br />
Sorediose; branches dense and spreading, surface yellow maculate U. inszllaris<br />
Fertile<br />
Apothecia large, surface of branches yellow maculate but not sorediose (young<br />
sterile plants sparingly branched at acute angles, branches erect) U. Taylori<br />
Apothecia small, surface of branches with black annular cracks . . U. ciliata<br />
Axis 430-960p; apothecia very large, axis not lacerate . . . . U. substrigu!osa<br />
Axis slender, 300-500~<br />
Sorediose<br />
Surface smooth, soredia germinating in sidu to form dense tufts of propagula,<br />
suggesting witches' b~ooms . . . . . . . . U. propagulif era
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