FIGURE 4. Morphology of the spores. A–D Rumohra ponceana. A. LM micrograph of a spore in equatorial view. Tuberculate perispore is evident. B–D. SEM micrographs. Tubercles of different sizes and shapes are observed over the entire surface. B. Spore in equatorial view. C. Spore in distal view. D. Spore in proximal view. Tubercles on the laesurae are observed (arrows). E–H. Rumohra adiantiformis. E. LM micrograph of a spore in distal view. Folded perispore with scattered tubercles. F-H. SEM micrographs. F. Spore in distal view with folded perispore with irregular tubercles. G. Spore in equatorial view. Tubercles in distal pole are evident. H. Spore in proximal view. Rugulated perispore and a straight and tenuimarginate laesura are evident (arrow). A from de la Sota 5291; B–D from de la Sota 5283 and Meza Torres et al. 315; F–H from Berrueta et al. 343.

Published as part of Arana, Marcelo D., Luna, María Luján, Berrueta, Pedro C., Martinenco, María Luz & Giudice, Gabriela E., 2021, Rumohra ponceana (Polypodiales: Dryopteridaceae): a new species from Pampean biogeographic province in Argentina, pp. 27-38 in Phytotaxa 521 (1) on page 33, DOI: 10.11646/phytotaxa.521.1.3, http://zenodo.org/record/5530478