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28 Vagn Alstrup
in development. Therefore the new species is
placed in Merismntium and not rn Phneospora.
Phoma lobariicola Alstrup ,q,p. nov.
Pycnidia dispersa sed inter se appropinquata,
sessilia, fusca, ad circiter 50 pm diam.
Conidiophora nulla; cellulae conidiogenae
circiter 4 x 3 pm magnae; conidia 6-7 .5 x 2-2.5
pm magna, hyalina, non septata, gutfulata.
Type: Norway, Nord-Trondelag, Overhalla,
c. 1 km. W of Foss, UTM 32W l33W PS
4453/UM 5553, ffiop 1723 I, alt. 50-100 m, old
spruce forest, boreal rain forest, on Lobaria
scrobiculata, 28 July 1993, V. Alstrup (C,
holotype; IMI 360735b, isofype).
Scnidia dispersed but close to each other,
sitting, brown, up to c. 50 pm diam.
Conidiophores absent, conidiogenous cells c. 4
x 3 pm, conidia 6-7 .5 x 2-2.5 Ffr, hyaline, not
septate, gutrulate.
Phoma lobariicola invades fresh thallus of the
host, which subsequently turns brownish. About
1000 pycnidia can occur per cttf . Later
apothecia of Scutula lobariicola arise scattered
between the Phoma conidia, which therefore is
supposed to be the anamorph of S. Iobariicola.
Phoma Sacc. is a large form-genus with
several lichenicolous species, however, none of
the descriptions of species included in Clauzade
et al. (1989) or Sutton (1990) fits the present
fungus, and no species of Phoma has been
reported from a species of Lobaria.
Scutula lobariicola Alstrup sp. nov.
Apothecia dispersa, nigra, 0.3-0.4 mm diam.,
sessilia, ad bases constricta, semper plana.
Excipulum persistens, in sectione fuscum, 35-40
pm altum. Hymenium 55-65 pm altum, pallide
fuscidum; subhymenium pallidum, circiter 40
pm altum; paraphyses 2 pm crassae, cellulis
apicalibus ad circiter 4 pm incrassatis, fuscocalyptratis
epithecium fuscum formantibus. Asci
circiter 55-60 x I5-I7 pm magni, tholis J
(Lugol) * caeruleis, 8-spori. Ascosporae hyali-
GRAPHTS SCRTPTA 8 (1997)
00
08
Figure 4. Holotype of Scutula lobariicola.
Ascus in Lugol, paraphysis and ascospores in
water. Bar 10 pm.
nae, l-septatae, 11.5-13.5 x 4-5 pm magnae.
Figure 4.
Type: Norway, Nord-Trondelag, Overhalla,
c. 1 km W of Foss, UTM 32W l33W PS
4453lUM 5553, map 1723 I, alt. 50-100 m, old
spruce forest, boreal rain forest, on Lobaria
scobiculata, 28 July 1993, V. Alstrup (C, holotype;
IMI 360735a, isorype).
Apothecia dispersed, black, 0.3-0.4 mm diam,
sitting, constricted at base, disc persistently flat.
Exciple persistent, brown in section, 35-40 pm
high. Hymenium 55-65 pm high, pale brownish,
subhymenium pale, c. 40 pm high, paraphyses 2
pm thick, with enlarged, brown-capped end
cells c. 4 pm thick forming a brown epithecium.
Asci c. 55-60 x l5-I7 pm, with tholus
J(Lugol) + blue, 8-spored. Ascospores hyaline,
l-septate, 11.5-13.5 x 4-5 pm.
Scutula lobariicola is found on living but
slightly discolored thallus of the host. The
apothecia arise between pycnidia, which may
cause the discoloration, and which are supposed
to represent an anamorph of the Scutula,
described as Phoma lobariicola above.
Scutula Tul. is in need of a revision.
Several species are reported on Peltigera and
Solorina, deviating especially in colour, which
varies according to light conditions. Other
species occur on Cladonia, Ramnlina, Leptogium,
Polychidium, Stereocaulon and crustose