AbstractVolemitol inLophoeolea bidentataandPlagioehila spinulosa, volemitol and sedoheptulose inBazzania trierenataandLepidozia reptans, and mannitol inBarbilophozia floerkeiandSeapania undulataare photosynthetic products in addition to sucrose and fructans. Polyols are not primary assimilatory products inMylia taylori, Nardia sealaris, Saeeogyna vitieulosaorPorella platyphylla. It is concluded that neitherMylianorSaeeogynais closely related to the Plagiochilaceae/Lophocoleaceae complex and that chemotaxonomic investigation would aid the classification of the Jungermanniaceae s.l.