What is difference between Apothecium and perithecium?
The apothecium is a cup shaped fruiting structure. The perithecium is a flask-shaped fruiting structure. The apothecium layer remains exposed. In perithecium asci is found in parallel structure on the floor and the basal sides of the flask-shaped portion.
What are the 3 types of lichens?
There are three main types of lichens:
- Foliose.
- Fruticose.
- Crustose.
What is the relationship between an ascocarp and an apothecium?
What is the relationship between an ascocarp and an apothecium? An apothecium is a cup-like fungus that has ascu lining the upper surface; it is a cup-like ascocarp. How does the fungal component of a lichen obtain its food?
Is it OK to touch lichen?
it’s lichen! Together, some fungus and algae create an organism called lichen. In a symbiotic relationship, the algae and fungus both help each other survive. be careful not to touch Lichens because they are fragile.
How long does lichen take to grow?
Lichens grow by extending their thallus outwards, from either its tips or edges. They grow very slowly, some species more slowly than others. Rates of growth can vary from 0.5mm per year to 500mm per year. Their slow growth rate equates with their long life.
What causes lichen to grow?
It gets all of the nutrients it needs from rain and the surrounding air. Lichen is usually the first type of organism to appear after a natural disaster, such as a fire. It can survive when plants can’t and can grow on rough surfaces like rocks or old fences.
What does Pycnidia mean?
Definition of pycnidium : a flask-shaped fruiting body bearing conidiophores and conidia on the interior and occurring in various imperfect fungi and ascomycetes.
What does the apothecia of a lichen look like?
The apothecia of lichens vary in colour which ranges from reddish, reddish brown, yellow to black depending upon the species. In many lichen species (Lecidea, Cladonia and Gyrophora) the apothecium consists of fungal elements only.
Where does the soredium come from in a lichen?
In Parmelia and Physcia, the soralia are often seen as small, white pustules. Soredia are produced from the algal layer of the lichen thallus. As the soredium is formed it is pushed outward by the elongation of the supporting hyphae.
What are the fungal and algal components of a lichen?
The fungal component is called the mycobiont and the algal component is known as the phycobiont. The two live in intimate association so that they appear to be a single plant. The fungal component forms the bulk of the lichen thallus. The algal component occupies only a small part comprising about 5-10 percent of the mass of the thallus.
How are rotifers living on the surface of apothecia?
A somewhat unusual method of ascospore distribution has been described by Pyatt (1968d). Rotifers living on the surfaces of apothecia of Xanthoria parietina actively ingest ascospores. Possibly these rotifers may be splashed off and could then continue to move in a water film.