Blennothallia is a genus of jelly lichens in the family Collemataceae. It has four species, which collectively have a cosmopolitan distribution.[1]

Collema crispum T90 (4).jpg
Blennothallia crispa
Scientific classification e
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Peltigerales
Family: Collemataceae
Genus: Blennothallia
Trevis. (1853)
Type species
Blennothallia crispa
(Weber ex F.H.Wigg.) Otálora, P.M.Jørg. & Wedin (2013)

B. crispa
B. fecunda
B. furfureola
B. novozelandica


The genus was circumscribed in 1853 by Italian botanist Vittore Trevisan de Saint-Léon.[2] Although Trevisan did not select a type species for the genus, Lichen crispus was selected as lectotype in 2013.[3] The genus corresponds to the Colema crispum species group recognized in 1954 by Gunnar Degelius.[4] Molecular phylogenetic analysis shows that Blennothallia forms a well-supported lineage together with Scytinium and Lethagrium in the family Collemataceae.[3]


Blennothallia species have a dark olive-green to black thallus that typically measures 2–5 cm (0.8–2.0 in) in diameter, comprising rounded lobes that are 0.5 mm (0.02 in) wide. The thallus lacks a cortex, and the medulla is paraplectenchymatous (fungal tissue with a cellular structure superficially like the parenchyma of vascular plants). The photobiont partner is a member of the cyanobacteriaa genus Nostoc, which occurs in clusters. Ascospores, which number eight per ascus, are either in the size range 15–20 by 7–9 μm or 26–40 by 10–18 μm.[3]

Habitat and distributionEdit

Blennothallia lichens grow on the ground and on rocks, but rarely on bark. The genus has a cosmopolitan distribution, but is most frequently encountered in temperate regions.[3]



  1. ^ Wijayawardene, Nalin; Hyde, Kevin; Al-Ani, Laith Khalil Tawfeeq; Somayeh, Dolatabadi; Stadler, Marc; Haelewaters, Danny; et al. (2020). "Outline of Fungi and fungus-like taxa". Mycosphere. 11: 1060–1456. doi:10.5943/mycosphere/11/1/8.
  2. ^ Trevisan, V. (1853). Caratteri di tre nuovi generi di Collemacee. Vol. 2. Padova: Tipografia Sicca. pp. 1–4.
  3. ^ a b c d Otálora, Mónica A.G.; Jørgensen, Per M.; Wedin, Mats (2013). "A revised generic classification of the jelly lichens, Collemataceae". Fungal Diversity. 64 (1): 275–293. doi:10.1007/s13225-013-0266-1.
  4. ^ Degelius, G. (1954). The lichen genus Collema in Europe: morphology, taxonomy. Symbolae Botanicae Upsalienses. Vol. 13. pp. 1–499.