Problems in the Collemaceae Morphology Thallus cortication crustose foliose fruticose Apothecium Position Nature of paraphysium Spores Geographic Distribution Temp & Altitude Moisture & humidity more on Europe and N. Am. Phylogeny Biatorine & Lecanorine sessile to immersed to sessile unicellular to bitypospores corticate to corticate plectenchymatous to pseudopar smooth to hairy? Ontogeny immersed to sessile on lecanorine plectenchymatous to pseudopara smooth to foliolate apoth. Classification