A Synopsis of the Genera Skyttea, Llimoniella and - Lichens of ...

446 THE LICHENOLOGIST Vol. 32
FIG. 5. Skyttea radiatilis {Willey). A, ascoma surrounded by host thallus; B, ascospores; C, exciple;
D, asci and paraphyses tips. Scales: A= 100 \im; B = 5 um; C = 50 ^m; D = 5 jim.
40-48 x 5-8 |im. Ascospores
9-12(-16) x 3-5-5 pun.
hyaline, ellipsoid to ovoid, non-septate,
Host. Loxosporapustulata (thallus). The two last century specimens (incl. the
holotype) are very much reduced and do not allow a study of the thallus by
TLC; however, as the thalli in both specimens react K and KC + yellow and
C —, and strongly resemble recently collected thalli of L. pustulata, we
consider them as belonging to that species.
Distribution. USA (Arkansas, Kentucky, Massachusetts, North Carolina and
Rhode Island).
Observations. Initially, this species was considered to be a lichen belonging
to the genus Gyalecta. Tuckerman (1882) subsequently recognized that he had
described a lichenicolous fungus growing on 'a white thallus with little doubt
to be referred to Pertusaria multipuncta'. Recently, Santesson (in Esslinger &
Egan 1995) pointed out that Gyalecta radiatilis is a lichenicolous fungus,
perhaps a Skyttea. We confirm here that the species is a typical member of