Cryptothecia disjecta J. X. Xue & Lu L. Zhang, 2025
publication ID |
https://doi.org/10.3897/mycokeys.114.139180 |
DOI |
https://doi.org/10.5281/zenodo.14976229 |
persistent identifier |
https://treatment.plazi.org/id/97D8EE49-011D-5432-ACDE-6A13A38A6173 |
treatment provided by |
MycoKeys by Pensoft (2025-03-05 18:14:02, last updated 2025-03-05 18:32:09) |
scientific name |
Cryptothecia disjecta J. X. Xue & Lu L. Zhang |
status |
sp. nov. |
Cryptothecia disjecta J. X. Xue & Lu L. Zhang sp. nov.
Fig. 2 View Figure 2
Diagnosis.
The new species is distinguished from other Cryptothecia species by its verrucose pseudisidia, which are loosely scattered on the thallus. The upper parts of the pseudisidia are white or have darker dots.
Type.
China • Hainan Province, Baoting Li and Miao Autonomous County, Qixianling Hot Spring National Forest Park , 18 ° 42 ' 14.43 " N, 109 ° 41 ' 47.92 " E, alt. 325 m, on the bark of trees, 8 March 2023, J. X. Xue et al. 20230146 ( SDNU, holotype) GoogleMaps .
Description.
Thallus corticolous, up to 15 cm in diameter, ecorticate, cottony, dull, pale green, loosely attached to the substrate. Pseudisidia verrucose, loosely scattered on the thallus, upper parts white or with darker dots, and most pseudisidia have few projecting hyphae, 0.13–0.26 × 0.13–0.22 mm. Prothallus is usually distinct, thin, whitish byssoid, mainly composed of interwoven and radiating hyphae, 1.1–1.5 mm wide. Medulla white, with calcium oxalate crystals. Photobionts trentepohlioid, cells elliptical to oblong, single or aggregate into bundles, 10–23 × 7–18 µm. Hyphae 1–2.5 µm wide.
Asci and pycnidia were not observed.
Chemistry.
thallus C + red, K + pale yellow, P –, UV + pale grey-white; medulla and paraphysoids I + sky-blue. TLC: gyrophoric acid and lecanoric acid.
Etymology.
The epithet refers to its pseudisidia, which are verrucose and loosely distributed across the thallus.
Ecology and distribution.
This species is found only in China on the bark of trees in a humid tropical forest in Hainan Province.
Notes.
Morphologically, Cryptothecia disjecta is similar to both Herpothallon and Cryptothecia . However, we describe C. disjecta on the basis of its morphological and chemical characteristics and assign it to Cryptothecia on the basis of sequencing ( Aptroot et al. 2024). Cryptothecia disjecta is similar to C. eungellae G. Thor , as they both have whitish byssoid prothallus, I + sky-blue medulla and C + red thallus, but C. eungellae has 1 - spored asci, muriform ascospores, and gyrophoric acid and norstictic acid as secondary metabolites ( Thor 1997; Jagadeesh Ram and Sinha 2016).
Phylogenetically, Cryptothecia disjecta is clustered with C. bartlettii G. Thor. They both have cottony thallus, whitish byssoid prothallus and C + red thallus, but C. bartlettii has delimited ascigerous areas (developing in the thallus centre and covered with globose isidia-like structures), 1 - spored asci and muriform ascospores ( Thor 1997).
Additional specimens examined.
China • Hainan Province, Baoting Li and Miao Autonomous County, Qixianling Hot Spring National Forest Park , 18 ° 42 ' 14.43 " N, 109 ° 41 ' 47.92 " E, alt. 325 m, on the bark of trees, 8 March 2023, J. X. Xue et al. 20230144 ( SDNU) GoogleMaps ; • ibid., 20230145 ( SDNU) GoogleMaps .
Aptroot A, Cáceres MES, dos Santos LA (2024) The taxonomy of sterile Arthoniaceae from Brazil: White crusts on overhanging tropical trees can be named. Lichenologist 56 (1): 1–13. https://doi.org/10.1017/S0024282924000021
Jagadeesh Ram TAM, Sinha GP (2016) A world key to Cryptothecia and Myriostigma (Arthoniaceae), with new species and new records from the Andaman and Nicobar Islands, India. Phytotaxa 266 (2): 103–114. https://doi.org/10.11646/phytotaxa.266.2.4
Thor G (1997) The genus Cryptothecia in Australia and New Zealand and the circumscription of the genus. Symbolae Botanicae Upsalienses 32 (1): 267–289.
SDNU |
Shandong Normal University |
UV |
Departamento de Biologia de la Universidad del Valle |
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