Leptogium corticola
In Canada Leptogium corticola has a Nova Scotia Probincial Status of Yellow. Species designated with a Yellow status may need particular attention to avoid becoming extinct (Cameron & Neily, 2008).
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Lichenized.
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The flat, grey, spreading thallus of Leptogium corticola is 2-8 cm across with rounded lobes that are 2-20 mm wide and 125-300 μm thick. The pustulate lobes are very wrinkled, often upturned, and lacking isidia or lobules. The cortex consists of one layer of cells ranging from 3 – 10 μm in size, 1-2 rows of cells near the margin, and as many as 12 rows of cells under the apothecia where some cells are as large as 12 μm. The hyphae of L. corticola have a diameter of 2-3 μm. Concave, smooth, sessile apothecia occur frequently, measuring 0.5-2.0 mm across and having a pale brown or yellow to red-brown color. The thalloid exciple is 45-155 μm thick and the same color as the thallus. The proper exciple is 45-90 μm thick; it becomes thinner near the margins where it is approximately 10 μm thick. The yellow subhymenium is 35-70 μm deep, and the hymenium extends 90-150 μm. Atop the colorless hymenium, the epithecium is yellow or brown. The cylindrio-clavate asci are 80-95 x 10-16 μm, containing spores which are 0-1-septate longitudinally and 3-5-septate transversely. These spores are 16-26 X 6-13μm in size (Sierk, 1964; Brodo et al, 2001).
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Leptogium corticola is distributed through eastern North America and in South America (Dey, 1978). In Europe, it is present in the Adriatic region (Sierk, 1964).
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Leptogium corticola grows on bark of deciduous trees such as Acer rubrum (Cameron & Neily, 2008), although it also occurs on Juniperus,Thuja, and white cedar. Infrequently it also occurs on mossy rocks or decaying logs(Sierk 1964; Brodo et al 2001)
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