In the IK/IPNI such things usually are not typo's but the original spelling
(as it was published way back then). In those days latinization of personal
names had not yet crystalized: the spelling "berggreni" was what Petrie felt
it should look like. BRBR

As I understand it, in such cases it is permissible to correct the spelling.
Sometimes it takes years of wrangling, like the correction of Paphiopedilum
fairrieanum.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)