Punctelia colombiana

From Wikipedia, the free encyclopedia

Punctelia colombiana
Scientific classification edit
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Lecanorales
Family: Parmeliaceae
Genus: Punctelia
Species:
P. colombiana
Binomial name
Punctelia colombiana
Sérus. (1984)

Punctelia colombiana is a species of foliose lichen in the family Parmeliaceae. It is found in South America.

Taxonomy[]

The lichen was formally described as a new species in 1984 by Belgian lichenologist Emmanuël Sérusiaux, from collections made in the Andean Mountains of Colombia. The type specimen was collected near Medellín, at an altitude of 1,800 m (5,900 ft).[1] The species was later recorded in Argentina[2] and Brazil (Rio Grande do Sul).[3]

Description[]

The thallus of Punctelia colombiana attains a diameter of up to 18 cm (7.1 in).[3] It is tightly attached to its bark substrate, and has a greenish-gray to ash-grey colour. Pseudocyphellae are white, small (measuring 0.1–0.2 mm in diameter) and evenly distributed throughout the thallus surface. Isidia are present over much of the surface. The medulla is white, while the thallus undersurface is mostly black with a dark brown zone around the margin.[1] Rhizines are dark brown to black, with a branching pattern ranging from unbranched to irregular; they are abundant and evenly distributed around the margin.[3]

The conidia (asexual spores) are threadlike (filiform), measuring 9–12 by 1 μm. Ascospores are ellipsoid, number eight per ascus, and measure 14–16 by 10–13 μm. Major secondary chemicals present in the lichen are atranorin and gyrophoric acid.[1]

A 1996 study compared the morphological and chemical differences between Punctelia colombiana and Punctelia stictica, concluding that the species are closely related but distinct, and are possibly derived from Punctelia jujensis.[4] A lookalike species is Punctelia constantimontium, also found in South America. It is distinguished from P. colombiana by its hook-like (unciform) conidia, and its persistently flat lobulae that never develop into isidia.[3]

References[]

  1. ^ a b c Sérusiaux, Emmanuël (1984). "Punctelia colombiana sp. nov. (Parmeliaceae) from South America". Nordic Journal of Botany. 4 (5): 717–718. doi:10.1111/j.1756-1051.1984.tb01998.x.
  2. ^ Adler, Mónica T. (1989). "Two new species in Parmeliaceae (lichenized Ascomycotina) and new records for Argentina". Mycotaxon. 35: 399–404.
  3. ^ a b c d Spielmann, Adriano Afonso; Marcelli, Marcelo Pinto (2008). "Punctelia (Parmeliaceae, lichenized Ascomycota) from roadsides and slopes in the Serra Geral of Rio Grande do Sul, Brazil". Biociências. 16 (2): 79–91.
  4. ^ Adler, Mónica T. (1996). "A comparative study on Punctelia colombiana and Punctelia stictica (Parmeliaceae, lichenized Ascomycotina)". Mycotaxon. 58: 77–92.
Retrieved from ""