Abstract The current opinion and position paper highlights (1) correct assignation of indicator phospholipid fatty acids (PLFA), (2) specificity recycling PLFA in microorganisms, (3) complete extraction detection PLFA. straight-chain 14:0, 15:0, 16:0, 17:0 occur all i.e., also fungi not only bacteria. If the phylum Actinobacteria is excluded from group Gram-positive bacteria, remaining bacteria...