Byssoloma
Byssoloma is a genus of leaf-dwelling lichens in the family Pilocarpaceae.
Taxonomy
The genus was circumscribed by the Italian botanist Vittore Benedetto Antonio Trevisan de Saint-Léon in 1853.Description
Species in genus Byssoloma form crustose, effuse lichens that lack a . Their, or photosynthetic partner, is of the type, a form of green algae.The apothecia, are and approximately circular in shape. They lack a and possess a, which is a layer of loosely arranged hyphae that can appear hairy or web-like in some species. The hymenium, the spore-bearing tissue, reacts with iodine to turn blue. The, consisting of paraphyses, is unbranched or slightly branched and not or only slightly thickened at the tips.
The, a layer beneath the hymenium, is dark red-brown and may turn purple when treated with potassium hydroxide solution in European species. The asci, which are the sac-like structures where spores develop, typically contain eight spores. They have thick walls and a blue-staining apical dome with a darker blue tubular ring structure and an amyloid gelatinous coat.
The are three-septate, colourless, and found in European species. Asexual reproductive structures, the pycnidia, are also sessile and roughly spherical, usually covered by a layer of loosely interwoven hyphae. The conidiophores are unbranched, forming flask-shaped, , or ellipsoidal conidia that are constricted in the middle.
Chemically, argopsin, a secondary metabolite, is sometimes detected in one species, but otherwise, Byssoloma lacks lichen products.
Species
, Species Fungorum accepts 39 species of Byssoloma.- Byssoloma annuum
- Byssoloma aurantiacum
- Byssoloma australiense
- Byssoloma braulioi
- Byssoloma brunneodiscum – China
- Byssoloma carneum
- Byssoloma catarinense
- Byssoloma catillariosporum
- Byssoloma chlorinum
- Byssoloma confusum
- Byssoloma diederichii
- Byssoloma dimerelloides
- Byssoloma discordans
- Byssoloma fuscothallinum
- Byssoloma fuscum
- Byssoloma humboldtianum
- Byssoloma hypophyllum
- Byssoloma kakouettae
- Byssoloma laurisilvae – Europe
- Byssoloma leucoblepharum
- Byssoloma llimonae
- Byssoloma maderense
- Byssoloma marginatum
- Byssoloma meadii
- Byssoloma melanodiscocarpum – China
- Byssoloma microcarpum
- Byssoloma multipunctatum
- Byssoloma murinum
- Byssoloma permutans
- Byssoloma rubrofuscum – China
- Byssoloma rubromarginatum
- Byssoloma spinulosum
- Byssoloma sprucei
- Byssoloma subdiscordans
- Byssoloma subleucoblepharum
- Byssoloma subundulatum
- Byssoloma tricholomum
- Byssoloma vanderystii – Africa
- Byssoloma xanthonicum – New Caledonia