Several instances of porus, which I think mean porous, are unchanged as the use is consistent throughout.
The suffixes 'ceus' and 'ceous' are used interchangably, sometimes within the same paragraph.
Sometimes numbers like 1-1000 and 1-800 may mean 1\1000 and 1\800 respectively.
Measurements are apparently taken from various sources and use several standards, like mm., mc., MM., cm., lines, inches and µ. Sometimes the units of measurement are lacking and I assume they are µ for spore sizes. None are changed.