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Honegger, R 1987: Isidium formation and the development of juvenile thalli in Parmelia pastillifera (Lecanorales, lichenized ascomycetes). - Botanica Helvetica 97: 147-152. [RLL List # 140 / Rec.# 8714]
Abstract: 17 figures. ["Of all isidia-bearing taxa so far investigated, the isidia of P. pastillifera are the only ones which reach a high degree of external and internal differentiation on the mother thallus in an inversed position. Mature isidia represent dorsiventrally organized juvenile thalli which adhere to the substrate with their morphological upper side after detachment from the mother thallus."]

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