FIGURE 4 in Taxonomic revision of Riella subgenus Trabutiella (Riellaceae, Sphaerocarpales)

FIGURE 4. Scanning electron microscopy photographs of female involucres from dioicous species of Riella subgen. Trabutiella. A–B. R. cossoniana. C–D. R. echinata. E-F. R. mediterranea. A–B. Ellipsoid involucres with blunt apex and 8 broad wings. C–D. Ovoid involucres with apiculate apex and thin, irregular and discontinuous wings. E–F. Acuminate involucres with>12 thin, irregular and discontinuous wings. (A–B from 9.225 VAL-Briof., C–D from 9.233 VAL-Briof., E from 9.239 VAL-Briof., F from 9.247 VAL-Briof).