Groutiella tumidula (Mitt.) Vitt, Bryologist 82: 9. 1979. Macromitrium tumidulum Mitt., J. Linn. Soc., Bot. 12: 201. 1869. Type: Peru. Andes Peruvianae, Tarapoto in truncis praecipue Crescentia, rarius ad rupes; etiam in ripis fl. Huallaga ad Yurimaguas, 1000 ped., Spruce 101 (NY).