lichens of the lower ozark region of missouri and arkansas

1. Spores simple.
2. On bark of Pinus .....................................................C. nana
2. On bark of hardwo ods or lignum o f ro tting logs .............................C. savonica
Chaenothecopsis nana Tibell [CHANA] - crustose
Locally frequent on exposed to more often lightly shaded bark of Pinus echinata, usually growing on
the lower bole and base, especially on trees with well-developed plates and furrows in the bark.
Frequently the lower boles of Pinus echinata in wooded uplands have small sterile white patches that
are presumably this species.
Chaenothecopsis pusilla (Ach.) A.F.W. Schmidt [CHAPU] - crustose
Rare on well drained decorticate Pinus echinata in wooded uplands, usually in areas sheltered from
much direct water contact.
Chaenothecopsis savonica (Räsänen) Tibell [CHASA] - crustose
Apparently rare in the Lower Ozarks; known from a decorticate fallen Pinus log in a wooded upland.
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CHROMATOCLAMYS Trev. (Thelenellaceae)
Pale gray crustose lichens with thal li growing conformably over bryophytes, with brown perithecia,
photobiont cf. Trebouxia, asci fissitunicate, I-, with 2-4 hyaline to brownish, muriform ascospores;
1 species in the region.
Chromatoclamys muscorum (Fr.) Mayrh. & Poelt [CHRMU] - crustose
Uncommon over (usually pleurocarpous) bryophytes in mesic microhabitats in wooded uplands,
typically growing on or near shaded dolomite.
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CHRYSOTHRIX Mont. (Chrysothrichaceae)
Bright yellow l eprose lichens with ecorticate, unstr atified thalli, prothallus apparently lacking,
photobiont chlorococcoid, local material always sterile, but apothecia reported to be tiny, sessile,
with a thin ecorticate margin, asci with the inner wall extended into an I+ blue tube, with 8 hyaline,
ellipsoid, 3 septate spores; 2 species in the region.
1. Thallus corticolous, K- .................................................C. candelaris
1. Thallus saxicolous, K+ reddish ............................................ C. chlorina
Chrysothrix candelaris (L.) J.R. Laundon [CHRCA] - crustose
Occasional on boles of trees in woodlands, usually in mesic sites such as along streams or on talus
slopes. The thalli occur in zones not subject to water runoff, such as on the underside of leaning trees.
Acer saccharum seems to be a preferred substrate. [calycin and/or pinastric acid]
Chrysothrix chlorina (Ach.) J.R. Laundon [CHRCH] - crustose
Local in sheltered crevices and under overhangs of massive siliceous rock exposures on glades and
bluffs. This species occurs on both igneous rocks and sandstone. Local population usually have high
concentrations of calycin and react K+ reddish. [calycin, vulpinic acid]
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CLADINA Nyl. (Cladoniaceae)
Abundantly branched fruticose lichens without squamules or an evident primary thallus, branches
terete and hollow, apothecia globose and terminal, but usually absent, photobiont Trebouxia, asci with