Aggregatorygma triseptatum
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| Aggregatorygma triseptatum | |
|---|---|
Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Graphidaceae |
| Genus: | Aggregatorygma |
| Species: | A. triseptatum |
| Binomial name | |
| Aggregatorygma triseptatum | |
 Holotype: Fazenda São Francisco, Brazil | |
Aggregatorygma triseptatum is a species of lichen in the family Graphidaceae.[1] First described in 2014 from collections near Porto Velho in Rondônia, it forms pale gray-green patches on tree bark with distinctive star-shaped clusters of narrow fruiting bodies. The species is characterized by extremely small spores with three cross-walls and two unidentified secondary metabolites. It grows in the shaded understory of undisturbed Amazon rainforest and has since been recorded in several Brazilian states.
Aggregatorygma triseptatum was introduced as a new genus and species by Marcela Cáceres, André Aptroot, and Robert Lücking in a survey of Graphidaceae from Rondônia. The holotype was collected on March 15, 2012 on tree bark in primary rainforest at Fazenda São Francisco, about 30 km (19 mi) north of Porto Velho at an elevation of 100 m (330 ft). The original diagnosis emphasized the combination of aggregated, branched lirellae and extremely small, 3-septate ascospores. Sequence accessions from the type corroborated that the taxon did not cluster with existing graphidoid genera.[2]
In form, the species can resemble some Diorygma (such as D. poitaei and other small-spored taxa), but it differs in its distinctive clustering of lirellae, the consistently tiny, 3-septate spores, and its chemistry (two thin-layer chromatography (TLC) spots that do not match known standards). The authors therefore placed it in Aggregatorygma rather than expanding Diorygma.[2]