Thelomma santessonii

Thelomma santessonii, the tan nipple lichen,[1] is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae. Found in northern North America, it was formally described as a new species in 1976 by lichenologist Leif Tibell.[2] It is endemic to the coast and islands of Southern California and Baja California in Mexico.[3]

Thelomma santessonii
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Caliciales
Family: Caliciaceae
Genus: Thelomma
Species:
T. santessonii
Binomial name
Thelomma santessonii
Tibell (1976)

Thelomma santessonii has a yellowish tan color, and is areolate. The thallus has verrucae that measure up to 2.5 mm (0.10 in) broad. The expected results of chemical spot tests are KC− on the thallus, and K+ (red), P+ (yellow) on the mazaedia. When a long-wavelength UV light is lit on the thallus, it fluoresces a blue-white color. The ascospores of the lichen are spherical and lack any septa; they measure 14–16 μm.[1]

Endococcus thelommatis is a lichenicolous fungus that parasitizes Thelomma santessonii.[3]

References
  1. Sharnoff, Stephen (2014). A Field Guide to California Lichens. New Haven/London: Yale University Press. p. 357. ISBN 978-0-300-19500-2.
  2. Tibell, L. (1976). "The genus Thelomma". Botaniska Notiser. 129: 221–249.
  3. Kocourková, Jana; Knudsen, Kerry (2011). "Endococcus thelommatis, a new lichenicolous fungus from Southern California". Bibliotheca Lichenologica. 106: 173–178.


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