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| Figure 1. Upper cortex of Parmotrema margaritatum |
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| Figure 2. Soredia on lobed margins of parmotrema margaritatum |
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| Figure 3. K- upper cortex of Parmtrema margaitatum |
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| Figure 4. K+ Medulla of Parmotrema margaritatum |
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| Figure 5. Rhizines of Parmotrema margaritatum |
Phylum: Ascomycota
Family: Parmeliaceae
Species: Parmotrema margariatum
Collection date: 10/22/2015
Collector: Caroline Kaylor Georskey
Habitat: This lichen was found growing on the bark of tree on the Hiram College Campus.
Description: This is a greenish-gray lichen found growing on trees on the Hiram College Campus (Fig. 1). The upper cortex is K- (Fig. 3). The medulla is white but is K+ (turning yellow) as shown in figure 3. Rhizines are a dark brown in color and absent along the margins of the lower surface and prevalent elsewhere (Fig. 5). The edges of the lichen are not attached to the bark substrate unlike the center of the lichen, which is well secured to the tree. A knife or razor bland is needed to collect the specimen without damage, On the upper surface, the wide lobe margins are covered in soredia (fig. 2).
Key Used: Showman, R. E. & D .G. Flenniken. (2004). The macrolichens of Ohio. Colombus, Ohio; Ohio Biological Survey.
1. Thallus foliose...
2. Thallus some shade of gray, green, yellow-green, brown, or balck; not as above...
4. Thallus thick or thin, not gelatinous when wet; white medullary fibers sually apparent; various colors...
6. Rhizines present from lower surface (may be massed as a felty mat or umbilicate)...
11.Perithecia absent; apothecia, if present, sauce-shaped and superficial on the surface of the thallus...
13. Thallus not umbililcate, broadl attached to the substrate with scattered rhizines; on rock, soil, or bark...
15. Thallus contain green algae...
19. Medulla white or whitish sometimes stained pale buff or pink due to aging, chemicals, or weathering...
24.Thallus various, but without paw-shaped or fist-shaped lobe tips...
26. Lower surface with sparse to moderate or occasionally numerous rhizines, variable in color and length but not forming a uniform, brown, velvety nap...
28. Upper cortex K- or K+ weak yellow (atranorin); lobes variable in width...
29. Lower surface of the cortex throughtout; lobes narrow or broad; K+ or K-...
30. Thallus without pores, may be uniform or varisouly cracked, ridged, or white-maculate...
35. Thallus some shade of gray, gray-green, greenish, brown, or gray-brown...
36. Thallus some gray, gray-green, or greenish in color...
38. Thallus broadly foliose, the lobes 4-20 mm wide, apically rounded; thallus usually loosely attached with lobes tips somewhat ascending...
39. Lower surface with marginal bare zone free of rhizines (although cilia usually present); upper surface smooth to wrinkled, but without maculae or patterned cracking...
Parmotrema, p. 146
1. Corex some shade of gray, usinic acid absent, isidiate or not...
3. Thallus sorediate...
4. Soralia marginal or submarginal, cilia and upper cortex various...
5. Upper surface not white-maculate pattern...
7. Medulla K- or K+ turning red, salzinic acid present...
8. Medulla K+ yellow turning red, salazinic acid present, UV-...
Parmotrema margaritatum
For more information on Parmotrema margaritatum please review the following links:
http://plants.usda.gov/core/profile?symbol=PAMA21
http://www.waysofenlichenment.net/lichens/Parmotrema%20margaritatum
http://eol.org/pages/6569677/overview
Good pictures!
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