ichen ometry ▁are ▁those ▁of ▁the ▁gener a ▁Rh iz oc ar pon ▁( e . g . ▁the ▁species ▁Rh iz oc ar pon ▁ge ographic um ) ▁and ▁X anth oria . ▁The ▁measured ▁growth ▁rates ▁of ▁R . ▁ge ographic um ▁tends ▁to ▁fall ▁within ▁the ▁range ▁of ▁ 0 . 9 ▁- ▁ 0 . 3 ▁millimeter ▁per ▁year , ▁depending ▁on ▁several ▁factors , ▁including ▁the ▁size ▁of ▁the ▁l ichen ▁patch . ▁▁ ▁It ▁was ▁first ▁employed ▁by ▁Kn ut ▁F æ g ri ▁in ▁ 1 9 3 3 , ▁though ▁the ▁first ▁exclus ively ▁l ichen ometric ▁paper ▁was ▁not ▁published ▁until ▁ 1 9 5 0 , ▁by ▁Aust rian ▁Roland ▁Besch el ▁( 1 9 2 8 - 1 9 7 1 ), ▁in ▁a ▁paper ▁concerning ▁the ▁European ▁Al ps . ▁ ▁L ichen ometry ▁can ▁provide ▁dates ▁for ▁gla cial ▁depos its ▁in ▁t und ra ▁environments , ▁lake ▁level ▁changes , ▁gla cial ▁mor aines , ▁trim ▁lines , ▁p ala e of lo ods , ▁rock falls , ▁se ism ic ▁events ▁associated ▁with ▁the ▁rock falls , ▁tal us ▁( sc ree ) ▁stabil ization ▁and ▁former ▁extent ▁of ▁per ma f rost ▁or ▁very ▁persistent ▁snow ▁cover . ▁It ▁has ▁also ▁been ▁expl ored ▁as ▁a ▁tool ▁in ▁assess ing ▁the ▁speed ▁of ▁gla cier ▁retre at ▁due ▁to ▁climate ▁change . ▁ ▁Among ▁the ▁potential ▁problems ▁of ▁the ▁technique ▁are ▁the ▁difficulty ▁of ▁correctly ▁ident ifying