Slideshow image
Stereocaulon cumulatum (Sommerf.) Timdal
Family: Stereocaulaceae
[Biatora cumulata (Sommerf.) Tuck.,  more]
Stereocaulon cumulatum image
Life habit: lichenized (mutualistic with algal photobionts) thallus: squamulose (squamulous) thallus: compartimentized – areolate, squamulate [th] upper surface: grey(ish) | grey(ish) white [th upper surface]: epruinose [th marginal and upper surface] specific structures: absent [th] morphol substructures (eg areoles, lobes, branches) width [mm]: (min) 4.0 [th] morphol substructures (eg areoles, lobes, branches) upper surface: smooth, plane | uneven, undulate ascomata: absent | present ascoma: apothecial, apothecioid – hymenial ascoma [mm]: (median) 0.3 (max) 0.5 ascoma: subsessile, subimmersed, adnate, semi-immersed, emergent [ascm, if apoth] disc, mazaedium: plane, flat, flattened, expanded | subconvex, slightly convex [ascm, if apoth] disc, mazaedium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) [ascm, if apoth] disc, mazaedium: epruinose [ascm, if apoth] subhymenial layers, hypothecium; [if perith] basal excipulum: brown(ish) (if pale: fawn, tan; if mid: cinnamon) [ascm] paraphyses/-oids: present [ascm] epihymenium, epithecium: brown(ish) (if pale: fawn, tan; if mid: cinnamon) asci: lecanoralean [asc] tholus: thickened [asc] tholus amyloidity (iodine reaction): present [asc] tholus amyloidity pattern: with amyloid tube, ring (= Collema-, Micarea-, Porpidia-, Psora-types etc) ascospores: (median) 8.0 [asp] shape: ellipsoidal | fusiform [asp] length [µm]: (low) 12.0 (high) 20.0 [asp] width [µm]: (low) 4.0 (high) 5.5 (max) 6.0 [asp] septa: present [asp] septa: transversely septate [asp] transversal septa: (median) 1.0 [asp] pigmentation: hyaline, colourless [asp] perispore, epispore: not apparent secondary metabolites: present secondary metabolites: atranorin | lobaric acid | unknown/unidentified (tri-)terpenoid(s), (tri-)terpene(s) primary photobiont: present secondary photobionts (eg in cephalodia): absent | present primary photobiont: chlorophytaceous – trebouxiaceous, chlorococcoid.

substrate: soil, clay, humus, turf, detritus, dead leaves.