FIGURE 3 in Afroboletus sequestratus (Boletales), the first species with sequestrate basidioma in the genus

FIGURE 3. Ornamentation of basidiospores of Afroboletus and Strobilomyces. a. Afroboletus sequestratus (PC 0723575, type), showing the longitudinal costae; b. Afroboletus sequestratus (PC 0723575, type), showing the hilar appendix with a basal rim (arrow); c. Afroboletus multijugus (PC 0723570), showing the longitudinal costae, the basal rim (arrow) around the apiculus and the non-differentiation of a suprahilar plage; d. Afroboletus luteolus (SYN 1836), showing the longitudinal costae, the basal rim (arrow) around the apiculus and the absence of a suprahilar plage; notice that a secondary surface ornamentation of longitudinal ridging with occasional branching is present between the costae; e. Strobilomyces pteroreticulosporus (HKAS 91274), showing the reticulate ornamentation, and the presence of a suprahilar plage (arrow); f. Strobilomyces seminudus (HKAS 59461), showing the subcristate to verrucose ornamentation, and the presence of a suprahilar plage (arrow). Bars = 2 μm. Photos by L.H. Han.