''Oxneria fallax'', also known as the hooded sunburst lichen, is a small yellow-orange to red-orange
foliose
Foliose lichen is one of the morphological classes of lichens, which are complex organisms that arise from the symbiotic relationship between fungi and a photosynthetic partner, typically algae. This partnership allows lichen to live in divers ...
lichen that grows on bark or rarely on rock or bone.
It is found all over the world except very dry areas, with 10 species common in North America.
[Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, ][Lichen Flora of the Greater Sonoran Desert Region. Vol 2, Nash, T.H., Ryan, B.D., Gries, C., Bugartz, F., (eds.) 2001]
/ref> The nonfruiting body (thallus
Thallus (plural: thalli), from Latinized Greek (), meaning "a green shoot" or " twig", is the vegetative tissue of some organisms in diverse groups such as algae, fungi, some liverworts, lichens, and the Myxogastria. Many of these organisms ...
) grows in rosettes to 3 cm in diameter.[ The rosettes sometimes coalesce with each other.][ The lobes may appear divided at the tips. It is sometimes tightly appressed to the substrate (]adnate
Adnate may refer to:
* Adnation, in botany, the fusion of two or more whorls of a flower
* Adnate, in mycology, a classification of lamellae (gills)
* Conjoined twins
Conjoined twins – sometimes popularly referred to as Siamese twins – are ...
), and sometimes not.[ The fruiting bodies (]apothecia
An ascocarp, or ascoma (), is the fruiting body ( sporocarp) of an ascomycete phylum fungus. It consists of very tightly interwoven hyphae and millions of embedded asci, each of which typically contains four to eight ascospores. Ascocarps are mo ...
) are lecanorine
A lichen has lecanorine fruiting body parts if they are shaped like a plate with a ring around them, and that ring is made of tissue similar to the main non-fruiting body part of the lichen.Field Guide to California Lichens, Stephen Sharnoff, Yale ...
, meaning that they are disc-like with a ring or rim of tissue around the disc that is made of tissue similar to the thallus.[ The tips of the lobes form hood shaped ]soralia
Soredia are common reproductive structures of lichens. Lichens reproduce asexually by employing simple fragmentation and production of soredia and isidia. Soredia are powdery propagules composed of fungal hyphae wrapped around cyanobacteria ...
that produce powdery greenish yellow soredia
Soredia are common reproductive structures of lichens. Lichens reproduce asexually by employing simple fragmentation and production of soredia and isidia. Soredia are powdery propagules composed of fungal hyphae wrapped around cyanobacteria or ...
.[ It prefers growing on elm or oak bark, but can also be found on rocks, bone, or other wood types.][ ]Lichen spot tests
A spot test in lichenology is a spot analysis used to help identify lichens. It is performed by placing a drop of a chemical on different parts of the lichen and noting the colour change (or lack thereof) associated with application of the chemica ...
on the surface are K+ purple, C−, KC−, and P−.[
]
References
{{Taxonbar, from=Q10720981
Teloschistales