for those of you who have not already found it prof ralph martin has a searchable field number database online, it has recently been updated with a lot more field collection numbers you can see it here
http://ralph.cs.cf.ac.uk/Cacti/fieldno.html
cactus and succulent collector's field number database
cactus and succulent collector's field number database
incurable cactoholic
growing rebutia's with a mix of others.
growing rebutia's with a mix of others.
Hi Robert- It does have the reverse finder feature, here:
http://ralph.cs.cf.ac.uk/Cacti/finder.html
peterb
http://ralph.cs.cf.ac.uk/Cacti/finder.html
peterb
Zone 9