3.7: Lichens - Biology LibreTexts
Figure \(\PageIndex{4}\): A cross section through an apothecium of the lichen Physcia. The apothecium is circled by a dotted line, A) hymenium composed of asci and paraphyses, B) upper cortex, C) photobiont layer (stained pink), D) medulla.
Life History and Ecology of Lichens - University of California …
An apothecium is a fungal reproductive structure, in which the fungus reproduces itself through the production of spores. These spores will disperse and germinate into new fungi, but they will not produce new lichens. For a lichen to reproduce, but the fungus and the alga must disperse together. Lichens reproduce in two basic ways.
3.5.2: Types of Ascocarps - Biology LibreTexts
Apothecium. Apothecia are cup-shaped with the hymenium fully exposed (lining the interior of the cup), though this can be inverted and take on strange shapes (see Figure \(\PageIndex{3}\)).
Diagram of apothecium architecture of a lichenized fungus. On display is a section of the apothecium with its asci and paraphyses of Solorina saccata. Also shown is the spore mass taken from the mazaedium of Calicium viride, a pin lichen. Here the asci disintegrate and the spores are directly exposed to the wind, ready for dispersal. Exercise 1.
Lichen morphology - Wikipedia
A podetium (plural podetia) is a lichenized stem-like structure of an apothecium rising from the primary body of the thallus. [4] . Since it is part of the reproductive tissue, it is not considered part of the thallus. [4] . The podetium may be branched, and sometimes cup-like. It usually bears the pycnidia or apothecia or both. References.
Reproductive Structures - Lichen website - ANBG
The hymenial surface is referred to as the disc of the apothecium. In many lichens the apothecial margins are composed solely of fungal tissue (typically different from the paraphyses and asci of the hymenium) though there are also many species in which the apothecial margin bears an extra layer, composed of fungal and photobiont cells, derived ...
Lichen life cycle - The British Lichen Society
Apothecia (singular apothecium) are disc or saucer shaped and usually have a rim round them (Figure 2). The asci are lined up with vertical supporting hairs (called paraphyses singular paraphysis) in a central layer and fire their spores vertically into the air. Some are compacted side-ways, so the rims meet to form a long thin ascocarp with ...
Apothecia - an overview | ScienceDirect Topics
Two broad types of ascocarps, the perithecium and apothecium, are traditionally recognized in lichens, just as in the nonlichenized Ascomycetes. The asci of perithecia are immersed in a perithecial cavity which is bounded by an exciple distinct from the thallus.
Diversity and ecological adaptations in Palaeogene lichens
2017年4月24日 · A lichen-symbiotic lifestyle has evolved at least ten times in the Ascomycota and five times in the Basidiomycota 1 – 3, with a vast majority of the over 18,000 currently known species of...
Crustose lichens with lichenicolous fungi from Paleogene amber …
2019年7月17日 · Identification of crustose lichens is very challenging even with extant specimens, and often without precise information on anatomy (e.g. ascus structure, apothecial margin anatomy or size and ...