Diorygma archeri is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.[1] Found in Vietnam, it was formally described as a new species in 2013 by Santosh Joshi and Jae-Seoun Hur. The type specimen was collected from Yok Đôn National Park (Đắk Lắk province) at an altitude of about 760 m (2,490 ft). The species epithet honours Australian lichenologist Alan W. Archer.[2]
| Diorygma archeri | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Graphidaceae |
| Genus: | Diorygma |
| Species: | D. archeri
|
| Binomial name | |
| Diorygma archeri S.Joshi & Hur (2013)
| |
Description
editDiorygma archeri has a flat thallus that is usually white or grayish-green in color and up to 800 μm thick. The outer layer of the lichen (the pseudocortex) is distinct, reaching up to 30 μm. The algal layer is well-developed and about 50–60 μm thick. The inner layer, the medulla, is white and thick, with crystals scattered throughout it.[2]
The fruiting bodies of the lichen, called ascomata, are numerous and can vary in shape, with some being short and curved while others are more branched. They are covered by a brownish or reddish-brown layer that is surrounded by a raised, irregular margin. The hymenium, which is the part of the ascomata that contains the spores, is hyaline and can be seen to be violet-blue when treated with certain chemicals. The spores themselves are oval to elliptic in shape, multicellular, and range in size from 150 to 255 x 53 to 85 μm.[2]
Diorygma archeri contains protocetraric acid, a lichen product that can be detected using thin-layer chromatography.[2]
Diorygma archeri is comparable to Diorygma pruinosum, but the two differ in several ways. Specifically, D. archeri has a thick, distinctly corticate body that is grayish-green in color and contains a well-developed medulla. The apothecial disc of D. archeri is only slightly open, and its proper exciple is not carbonized. Additionally, Diorygma archeri has larger ascospores than D. pruinosum.[2]
References
edit- ^ "Diorygma archeri S. Joshi & Hur". Catalogue of Life. Species 2000: Leiden, the Netherlands. Retrieved 15 March 2022.
- ^ a b c d e Joshi, Santosh; Jayalal, Udeni; Oh, Soon-Ok; Koh, Young Jin; Nguyen, Thi Thuy; Dzung, Nguyen Anh; Hur, Jae-Seoun (2013). "New species and new records in the family Graphidaceae (Ascomycota: Ostropales) from Vietnam". The Lichenologist. 45 (5): 599–609. doi:10.1017/s002428291300025x.