Inhibition of Moss Spore Germination by Acetone Extracts of Terricolous Cladonia Species

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Abstract
Spores of Funaria hygrometrica Hedw., Weissia controversa Hedw., Mnium cuspidatum Hedw., Amblystegium serpens (Hedw.) B.S.G., Pohlia nutans (Hedw.) Lindb. and Physcomitrium pyriforme (Hedw.) Hampe were sown on filter papers impregnated with acetone-soluble extracts of each of the terricolous lichen species C. subcariosa Nyl., C. cristatella Tuck. and C. squamosa (Scop.) Hoffm., and saturated with 3 concentrations of Hoagland''s solution (0%, 25% and 50%). Percent spore germination was determined for each moss species and compared to spore germination for controls. All species except A. serpens and P. nutans showed complete inhibition of spore germination in the presence of the lichen extracts. Amblystegium exhibited delayed germination and Pohlia exhibited reduced germination in the presence of the lichen extracts. The ecological significance of this inhibitory influence in habitats where terricolous cryptograms coexist may be considerable.

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