Physarum rubiginosum Fr. & Palmquist, Symb.

Treviño-Zevallos, Italo, García-Cunchillos, Iván, Basanta, Diana Wrigley De & Lado, Carlos, 2023, Diversity of Myxomycetes from Peru Part III: The high Andes and the altiplano, Phytotaxa 624 (1), pp. 1-92 : 72

146. º Physarum rubiginosum Fr. & Palmquist, Symb. gasteromyc., fasc. 3: 21 (1818)

Specimen examined. PERU. Cusco: Anta, Chinchaypujio, Parccotica , Chinchipuya , Km 8,650, 3608 m, 13º34′07”S, 72º14′27”W, 17 Apr 2016, leaves of Alnus acuminata, Lado 24423 (MA-Fungi 95762) .

Notes. Physarum rubiginosum has orange scales in the peridium and capillitium ( Fig. 4C ) with angular, calcareous concretions. Similar to Ph. lateritium (Berk. & Ravenel) Morgan , differing by its capillitium with calcareous concretions with rounded borders.

Known from Europe and North America ( Poulain et al. 2011), in the Neotropics, it has been recorded from the Windward Islands, Jamaica, and Mexico ( Lado & Wrigley de Basanta 2008). It is the first record for South America, inhabiting the litter of Alnus acuminata trees.

Figures

FIGURE 4. A. Sporocarps of Physarum crateriforme (MA-Fungi 95849). B. Physarum dictyospermum (MA-Fungi 97733). C. Physarum rubiginosum (MA-Fungi 95762). D. Physarum squamosum (MA-Fungi 95240). E. Spores by SEM of Physarum synsporum (MA-Fungi 94524). F. Sporocarps of Polyschismium trevelyanii (MA-Fungi 96168). Scales A-D, F = 0.2 mm; E = 5 µm.