Get started
Work

Parmotrema undetermined-4

Year: 2025
Type: other
Abstract: Parmotrema specimen 4 Specimen. Geoscientific Collection of the University of Göttingen, Germany (GZG), GZG.BST.22085; syninclusion Frullania chiapasensis. Age and stratigraphic level. 15‒23 Ma, Langhian – Aquitanian (early to middle Miocene), Simojovel, Chiapas, Mexico. Description. Lichen fragment approximately 2.3 × 4.5 mm in diameter. Thallus foliose, lobate. Lobes flat and linear, 0.5-1.0 mm wide, lobe apices truncate to slightly rounded (Fig. 8 D). Upper surface smooth, brown (Fig. 8 D). Marginal cilia dark, mainly simple, up to 0.5 mm long (Fig. 8 D). Medulla not visible. Lower cortex concolorous with the upper surface (Fig. 8 E). Rhizines dark, abundantly branched (Fig. 8 E). Apothecia, isidia, soredia, or pycnidia not present. Discussion. The general habit and long, tapering marginal cilia identify the specimen as Parmotrema. The branching rhizines and long, tapered marginal cilia resemble the Canomaculina group. However, unlike the Canomaculina group, the fossil inclusion seems to possess a smooth upper surface of the lobes that visibly lack maculae.
DOI: 10.5281/zenodo.14947562
Authors: Feldberg, Kathrin, Kaasalainen, Ulla, Mamontov, Yuriy S., Gradstein, S. Robbert, Schäfer-Verwimp, Alfons, Divakar, Pradeep K., Schmidt, Alexander R.
Institutions: University of Göttingen, University of Helsinki, Finnish Museum of Natural History, Russian Academy of Sciences, Tsitsin Main Botanical Garden of the Russian Academy of Sciences, Meise Botanic Garden, Universidad Complutense de Madrid
Language: English
Open Access status: green
OpenAlex ID: W6930782976
Cites:
Cited by:
Related to: