1. The Peltigera type: the sporophores consist of a basal cell bearing one or more long sterigmata and rather stoutish ellipsoid spores. (These are true pycnidia.)
2. The Psora type: a more elongate simple sporophore with sterigmata and oblong spores.
3. The Cladonia type: a branching sporophore, each branch with sterigmata and oblong spores.
4. The Squamaria type (called by Glück Placodium): also a branching sporophore but with long sickle-like bent spores.
5. The Parmelia type: a more complicated system of branching and anastomosing of the sporophores, with oblong spores.
6, and 7. The Sticta and Physcia types: in both of these the sporophores are multi-septate; they consist of a series of radiately arranged hyphae rising from a basal tissue all round the pycnidium. They anastomose to form a network and bud off “spermatia” from the free cells or rather from minute sterigmata. In the Physcia type there is more general anastomosis of the sporophores and frequently masses of sterile cells along with the fertile members occupy the centre of the pycnidium. The spermatia of these and the following Endocarpon type are short cylindrical bodies ([Fig. 113 B]).
Fig. 113 B. 7, Physcia ciliaris DC. × 600; 8, Endocarpon sp. × 600 (after Glück).
8. Endocarpon type: the pycnidium is filled by a tissue of short broad cells, with irregular hollow spaces lined by fertile cells similar to those of the Sticta and Physcia types.