Rudolf Arnold Maas Geesteranus (1911- 2003) (Maas Geest.)
Lichenologist (Netherlands)
Published author of:
- Evernia prunastri var. herinii (P.A. Duvign.) Maas Geest., 1954
- Parmelia aspera f. aspidota (Ach.) Maas Geest., (1948) (see Melanohalea exasperata)
- Physcia grisea f. harmandii Maas Geest., 1952
- Physcia grisea f. sorediosa (Malbr.) Maas Geest., 1952
- Physcia nigricans f. tremulicola (Nyl.) Maas Geest., 1952
- Xeromphalina aspera Maas Geest., Persoonia 15(1): 50 (1992)
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