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arx and c. proquinqua (bubák and vleugel) arx are excluded from the genus while rhabdogloeum hypophyllum d. e. ellis and gill is transferred to it.
arx et c. proquinqua (bubák et vleugel) arx sont exclus du genre alors que rhabdogloeum hypophyllum d. e. ellis et gill est transféré au genre cryptocline.

2, 2-7. vleugels, g.j., roekens, e.j., and van grieken, r.e. "study of the weathering of bare and treated limestone in ambient atmospheric conditions", in "science, technology and european cultural heritage", eds.
vleugels, e.j. roekens, r.e. van grieken, « study of thé weathering of bare and treated limestone in ambient atmospheric conditions », in science, technology and european cultural héritage, s. boer, c. sallioni, a.l. sors éd., commission of thé european communities, 1991, p.