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Racomitrium
4
Radula
8
Radulaceae
8
Railroads
3
Ramalina
6
Ranunculaceae
3
Ranunculales
5
Rauiella
1
Recruiting & enlistment
16
Refugees
2
Rhabdoweisia
1
Rhabdoweisiaceae
1
Rhamnaceae
2
Rhizocarpon
2
Rhizogoniales
19
Rhizoplaca
2
Rhodobryum
6
Rhynchospora
27
Rhynchostegiella
1
Rhytidiadelphus
16