Hi Martin,
Buchwalde, Koschmin was in Pogorzela (Kozmin) catholic parish which included villages: Bielawy, Cegielnia Głuchowska, Cegielnia Pogorzelicka, Dobrapomoc, Elżbietkowo (Elisenhof), Felicyanowo, Głuchowo, Gumieniec, Łukaszewo, Pogorzela,
Taczanowo (Buchwald)Buchwald was a farm belonging to Pogorzela, not existing now – pls see the map:
https://www.google.pl/maps/place/Pogorz ... 3fd0d6a411Not far from Pogorzela, in Borek Wielkopolski you can find name Lerch:
Protestant community Borek, entry 1 / 1882
Carl Albert
Lerch (29 years old)
father: Michael Lerch
Anna Marie Martha Krupke (20 years old)
father: Carl Krupke
Larch name appears in:
Catholic parish Rychwał, entry 12 / 1827
Michał Larek alias
Larch (26 years old)
Łucja Filipczakowna (19 years old)
Rychwał is 150 km from Wrocław.
If you give some more information, hopefully someone will be able to help you.
Regards,
Gosia