soredia and isidia
Firstly, a lichen may produce soredia, or a cluster of algal cells wrapped in fungal filaments. (2002). Isidia contain algal cells as well as fungal tissue, i.e.  After their release, the soredia disperse to establish the lichen in a new location. Ascospores disperse only the fungus. https://www.thefreedictionary.com/Soredia, From the observation (refer to figure 2), there are two major differences between Cryptothecia striata in the FACE Station and Control Station which are the colour of thallus/prothallus and the frequency of.  Lichens reproduce asexually by employing simple fragmentation and production of soredia and isidia. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Like isidia, soredia are dispersal packages of both fungus and alga. Soredia are common reproductive structures of lichens. Blastidia are not easily distinguished from soredia and in practical terms can be considered much the same. Soredia are common reproductive structures of lichens. Soredia resemble tiny dust balls and consist of one or more algal cells interwoven with fungal hyphae. Technically, blastidia bud from other blastidia and originally from the thallus edge or surface, and so might be in clusters or short chains, and they may be partly corticate. In Cladonia, the distinction between soredia and larger, perhaps partly corticate granules on podetial surfaces can be of identification importance. March 2014 Soredia are powdery propagules composed of fungal hyphae wrapped around cyanobacteria or green algae. (2009) (page 25, fig. the spore could land on another lichen, the fungus then taking over the phycobiont from the existing lichen. squamules, isidia, soredia, blastidia, phyllidia, schizidia, conidia. They may be produced from lichen surfaces lacking a cortex, e.g. the photobiontic layer also extends up into the isidia, and eventually they are liable to break away and be dispersed, leaving tiny scars on the thallus surface.  Fungal hyphae make up the basic body structure of lichen. Fortunately, the distinction is rarely critical in identification. This is a common phenomenon; e.g. Consequently, one of two things must happen: If, instead, the lichen can produce units of dispersal that contain both fungus and alga, this will obviously allow and speed up colonisation of new sites. They may be pretty much level with the lobe or crust surface, markedly convex, or in some species they are characteristically excavate (somewhat hollowed). The lichen primary thallus may be composed of squamules (squamulose lichens are more fully described here), or squamules may be produced from the surfaces of secondary structures such as podetia. They fall through a rent in the cortical layer in the form of dust and are distributed by the wind. Under favourable conditions each isidium grows into a new lichen thallus. It consists of algal cells and fungal hyphae covered by definite cortex. areolar edges and later extending across the areole surfaces. Other species are considered to produce blastidia instead, again often initially at the areolar edges. On substrates such as damp bark, they can germinate quickly and are a highly efficient medium of at least local dispersal. Conidia are asexual fungal spores, commonly thin-walled and usually functioning more as a means of rapid, local reproduction than of longer range dispersal. Photographs and text © A.J. This is fine; ascospores are generally thick-walled and are tough, resilient units of dispersal and there is a realistic chance of a small number of the ascospores arriving at suitable sites for germination. While necessarily included here as units of asexual dispersal, conidia cannot carry the phycobiont and so are not units for reproduction and dispersal of the complete lichen association.
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