2 . 5   µ m ▁on ▁the ▁surface . ▁The ▁fung us ▁has ▁been ▁called ▁the ▁" green ▁female ▁tr uffle " ▁because ▁of ▁its ▁super f icial ▁res embl ance ▁to ▁the ▁locally ▁common ▁species ▁T uber ▁pseud oh imal ay ense . ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : F ung i ▁described ▁in ▁ 2 0 1 5 ▁Category : F ung i ▁of ▁China ▁Category : P ez iz aceae <0x0A> </s> ▁Royal ▁Or dn ance ▁L 9 ▁is ▁a ▁British ▁short - bar rel led ▁ 1 6 5   mm ▁gun ▁used ▁for ▁combat ▁engineering , ▁particularly ▁the ▁demol ition ▁of ▁def ences . ▁ ▁Initial ly ▁called ▁Or dn ance ▁B L ▁ 6 . 5 " ▁M k ▁I , ▁it ▁was ▁later ▁renamed ▁ 1 6 5 mm ▁L 9 ▁Dem ol ition ▁Gun . ▁ ▁The ▁gun ▁is ▁capable ▁of ▁firing ▁a ▁ ▁High ▁Ex pl os ive ▁S qu ash ▁Head ▁( H ES H ) ▁demol ition ▁project ile ▁distances ▁up ▁to ▁. ▁The ▁H ES H ▁shell ▁contains ▁ 4 0   lb ▁of ▁C - 4 ▁explos ive . ▁ ▁The ▁L 9 ▁gun ▁was ▁mounted ▁on ▁Royal ▁Engine ers ▁AV RE ▁versions ▁of ▁the ▁Church ill ▁and ▁Cent ur ion ▁t anks ▁after ▁the ▁Second ▁World ▁War . ▁ ▁The ▁gun ' s ▁primary ▁purpose ▁is ▁the ▁clear ing ▁of ▁obst acles ▁such ▁as ▁walls , ▁f ences , ▁road block s ▁or ▁b unk ers