We find two chief types of fruit bodies in the lichens, the perithecium and apothecium; the first when the fungal element is a member of the Pyrenomycetes division of the Ascomycetes, the second when the fungus belongs to the Discomycetes division.
The two principal parts of which an apothecium consists are the hypothecium and the hymenium, or thecium.
The hypothecium is the basal part of the apothecium on which the hymenium is borne; the latter consists of asci (thecae) with ascospores, and paraphyses.
In the formation of this organ or that of the apothecium it has the general structure characteristic of that division of fungi.
The apothecia, though of the normal fungal type and usually disk-shaped, are somewhat more variable, and since the Morphologie and Biologie der Pilze, Mycetozoen und 1 The thalline margin (margo thallinus) is the projecting edge of a special layer of thallus, the amphithecium, round the actual apothecium; the proper margin (margo proprius) is the projecting edge of the apothecium itself.
- Diagram showing Apothecium in Section and surrounding Portion of Thallus, and special terms used to designate these parts.
- Vertical Section of Apothecium of Xanthoria parietina.
Cyclocarpineae, Apothecium usually circular, no capillitium.
Darbishire," Ober die Apothecium-entwickelung der Flechte, Physcia pulverulenta," Nyl.
Various types of ascocarp are characteristic of the different divisions of the Carpoascomycetes: the cleistothecium, apothecium and perithecium.
In the Helvellaceae there is no apothecium but a large irregular fruit body which at maturity bears the asci on its surface.
From the sclerotia later the apothecium develops.