oll ister ▁and ▁He e zen ▁describe ▁Cl ador h iza ▁conc res c ens ▁as ▁a ▁sp on ge ▁which ▁" some what ▁res emb les ▁a ▁space - age ▁mic row ave ▁anten na ", ▁while ▁Ag ass iz ▁described ▁the ▁sp ong es ▁as ▁having ▁" a ▁long ▁stem ▁ending ▁in ▁ram ifying ▁roots , ▁s unk ▁deeply ▁into ▁the ▁mud . ▁The ▁stem ▁has ▁nodes ▁with ▁four ▁to ▁six ▁club - like ▁append ages . ▁They ▁evidently ▁cover ▁like ▁bush es ▁extensive ▁tract s ▁of ▁the ▁bottom ." ▁ ▁References ▁ ▁Further ▁reading ▁▁▁▁▁ ▁Category : Out - of - place ▁artifact s ▁Category : E arth ▁myster ies <0x0A> </s> ▁The ▁EC ▁( E astern ▁Central ) ▁post code ▁area , ▁also ▁known ▁as ▁the ▁London ▁EC ▁postal ▁area , ▁is ▁a ▁group ▁of ▁post code ▁districts ▁in ▁central ▁London , ▁England . ▁It ▁includes ▁almost ▁all ▁of ▁the ▁City ▁of ▁London ▁and ▁parts ▁of ▁the ▁London ▁Bor ough s ▁of ▁Is ling ton , ▁Cam den , ▁H ack ney , ▁Tower ▁Ham lets ▁and ▁West min ster . ▁The ▁area ▁covered ▁is ▁of ▁very ▁high ▁density ▁development . ▁Del iver ies ▁for ▁the ▁EC ▁post code ▁area ▁are ▁made ▁from ▁Mount ▁Ple asant ▁Mail ▁Centre . ▁ ▁Post al ▁administration ▁The ▁current ▁post code ▁districts ▁are ▁relatively ▁recent ▁divisions ▁of ▁EC 1 , ▁EC 2 , ▁EC 3 ▁and ▁EC 4 , ▁which ▁were ▁established ▁in ▁ 1 9 1 7 . ▁When ▁the ▁districts ▁are