ich . ▁During ▁the ▁following ▁year ▁he ▁taught ▁classes ▁in ▁chem istry ▁and ▁sciences ▁at ▁a ▁secondary ▁school ▁in ▁W uns ied el , ▁and ▁in ▁ 1 8 9 9 ▁became ▁a ▁cust od ian ▁at ▁the ▁botan ical ▁museum ▁in ▁Mun ich . ▁In ▁ 1 9 0 2 ▁he ▁received ▁his ▁hab il itation ▁under ▁the ▁spons or ship ▁of ▁Karl ▁Ritter ▁von ▁Go eb el ▁and ▁Ludwig ▁Rad l ko fer . ▁After wards , ▁he ▁worked ▁as ▁a ▁professor ▁at ▁the ▁forest ▁academ ies ▁in ▁Eisen ach ▁( from ▁ 1 9 0 2 ) ▁and ▁Th ar and t ▁( 1 9 0 5 – 2 0 ), ▁and ▁in ▁the ▁meant ime , ▁took ▁research ▁tri ps ▁to ▁southern ▁Spain ▁( 1 9 0 7 ), ▁Dal mat ia ▁( 1 9 0 9 ), ▁C ors ica ▁( 1 9 1 1 ) ▁and ▁Sweden ▁( se ver al ▁times ). ▁In ▁ 1 9 2 0 ▁he ▁was ▁named ▁director ▁of ▁the ▁botan ical ▁inst itute ▁and ▁gard ens ▁at ▁the ▁poly techn ic ▁inst itute ▁in ▁Dresden . ▁ ▁The ▁my colog ical ▁gener a ▁Neg er iella ▁( H enn ., ▁ 1 8 9 7 ) ▁and ▁Mik ron eg eria ▁( D iet el , ▁ 1 8 9 9 ) ▁are ▁named ▁after ▁him , ▁as ▁is ▁the ▁amb ros ia ▁fung us ▁Wolfgang iella ▁fran zn eg eri ▁( C . ▁May ers , ▁T . C .