Dorjes J 1968 (citation)- p 198-202, description and illustration- good. Dorjes J 1968 (citation)- on ecology of in Germany p 98 and 87. Ehlers U, Doerjes J 1979 (citation)- in comparisons p 25, 26. Faubel A 1977 (citation)- on distribution and ecology. lists p 62 - a phytal species, p 70.
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