45. Diderma effusum (Schwein.) Morgan, J. Cincinnati Soc. Nat.Hist. 16(4): 155 (1894)

Specimens examined. PERU. Ancash: Huaraz, Independencia, Huaraz, route AN-139, km 12,5, 3690 m, 9º29′29”S, 77º28′24”W, 9 May 2018, stem of Bomarea involucrosa, Lado 26177 (MA-Fungi 96981), Lado 26185 (MA-Fungi 96990). Huari, Chavín de Huantar, route AN-110, km 51, 3766 m, 9º40′12”S, 77º11′59”W, 11 May 2018, leaves of Alchemilla orbiculata alive, Lado 26368 (MA-Fungi 97157), Lado 26369 (MA-Fungi 97158), leaves and twigs of Alchemilla pinnata, Lado 26371 (MA-Fungi 97160). Huari, Huamparán, 10 km south of Huachococha lagoon and 14 km north of Huamparán, 4162 m, 9º11′39”S, 77º12′42”W, 12 May 2018, leaf litter and herbs, Lado 26416 (MAFungi 97203). Ayacucho: Huamanga, Quinua, route PE-28B, km 30, Quinua, 3926 m, 13º00′19”S, 74º06′27”W, 20 Apr 2017, leaves of Polylepis racemosa, Lado 24867b (MA-Fungi 96071). Ocros, route PE-3S, km 470, Ocros, 3863 m, 13º22′41”S, 73º57′09”W, 21 Apr 2017, bryophytes on an oozing slope, Lado 24922 (MA-Fungi 96121, USM). Cusco: Anta, Chinchaypujio, Parccotica, Chinchipuya, Km 8,650, 3608 m, 13º34′07”S, 72º14′27”W, 17 Apr 2016, Alnus acuminata catkin, Lado 24440 (MA-Fungi 95779). Cusco, Pisac, Tambomachay, route PE-28G, Km 11, 3763 m, 13º28′53”S, 71º57′50”W, 16 Apr 2016, bark of Polylepis sp., Lado 24348 (MA-Fungi 95691, USM), Lado 24360 (MA-Fungi 95702, USM), Lado 24371 (MA-Fungi 95712), Lado 24378c (MA-Fungi 95721), Lado 24382 (MA-Fungi 95724), bryophytes, Lado 24386 (MA-Fungi 95727). Quispicanchi, Ccatca, Lahualahua, route PE-30C, Km 39.5, 3685 m, 13º38′57”S, 71º27′34”W, 15 Apr 2016, bark and leaf of Polylepis sp., Lado 24331 (MA-Fungi 95674, USM), Lado 24333b (MA-Fungi 95677). Huancavelica: Angaraes, Julcamarca, route PE-26B, km 146, Julcamarca, 3492 m, 13º00′45”S, 74º26′18”W, 22 Apr 2017, leaves of Baccharis sp., Lado 24977 (MA-Fungi 96175). Julcamarca, route PE-26B, km 146, Julcamarca, 3400 m, 13º01′52”S, 74º25′56”W, 22 Apr 2017, leaf litter of Alnus acuminata, Lado 25020 (MA-Fungi 96214), Lado 25021 (MA-Fungi 96215), Lado 25029 (MA-Fungi 96223), Lado 25030 (MA-Fungi 96224), bryophytes, Lado 25034 (MA-Fungi 96228, USM), Lado 25035 (MA-Fungi 96229), leaves of Alnus acuminata, Lado 25036a (MA-Fungi 96230), Lado 25037 (MA-Fungi 96232). Castrovirreyna, Castrovirreyna, Pacococha lagoon, route PE-3A, km 80, to 10 km at NE de Castrovirreyna, 4410 m, 13º14′26.3”S, 75º17′04.6”W, 25 Sep 2012, branch of Asteraceae, Lado 21805a (MA-Fungi 94573).

Notes. Spores in collections Lado 24348, 24360, 24371, 24378, and 24382 do not show grouped warts, a feature typical of this species, which could indicate poorly developed material.