Hertelidea
Crustose lichens containing trebouxioid algae; crust verrucose, areolate, granular or subsquamulose, light brown, grey or green; apothecia usually with a constricted base and sometimes almost stipitate, the apothecia usually clustered, sometimes forming dense masses; rim non-algal, formed of rounded cells usually surrounded by dense pigment masses; hymenium colourless or weakly pigmented upper portions, formed of moderately branching and anastomosing paraphyses embedded in gel; hypothecium colourless; asci with a distinctly thickened tholus that reacts IKI+ light blue with a darker blue tube running up its centre (this appearing as two parallel lines); spores 8 per ascus, colourless, usually non-septate.
References: Printzen 2004.
| 1a. | Thallus deep green when fresh, grey-green in herbarium specimens, areolate to granular, lacking soredia; apothecia 0.2-0.3 mm wide, mostly solitary or few together, dark brown to black, the rim coloured like the disc; spores 8-12 × 2-3 µ; known only from near Kamloops; to be sought …[Hertelidea viridis Björk ined.] |
| 1b. | Thallus brown to grey, granular and sorediate; apothecia somewhat smaller, tending to be many together in tight clusters, dark brown to black, the colour of the rim dark or pale; spores 7-13 × (2.5‑) 3-4 µ; known from near the study area, to be sought …[Hertelidea botryosa (Fr.) Kantvilas & Printzen] |