ry rtu

3.
4.
5.
119
Apothecia t immersed in the thallus, normally without
distinct margin; disc olivaceous to orange brown,
pigment K+ pinkish violgt'''''''''''' o'''' 4
epolnecia at least finally t sessile with distinct margin;
disc carneous (rarely chestnut brown), pigment K- 5
Exciple ] -, indistinct; spores ellipsoid, LO-12 x 5-5 pm;
on wet rocks near rivers etc. . . r. odora (schaerer) g- stein
Excip]-e I+ deep blue , distinct below; spores
* globose, g-10 x 5-8 pm; on wind-exposed
rnoUntain sUmmits . . I. ventosa P' M' 'JOrg' & R' Sant' ined'
Apothecia sma1I, O-1-0.2 mm diarn'; hymenium
I. carnosul,a (Arnold) r--^1r\ Arno1d r-:^rzr
perslsLcrIILIJ persistantlY JbT I+ \JEEy deeP blue v-Ev
aaLavS-'
' '
Apothecia larger to 0 . 5 mm diarn ' .; ; hymenium
f+green-bluetored-brogtn ' o ' ' ' ' ' ' ' '
6. Thallus + thin, continuous, sometimes cracked; apothecia
with smooth, distinct margin; spores 7-L2(15) x
5-7 um;* on wet acidiC roeks near rivers etc . I ' arctica Lynge
ThaLlus t,hicker , ! areolate or pulveruLent; apothecia
with irregular, sometimes thick margin; spores
(13)L6-22 x 10-12 Unl, on t dry calcareous rock . ' ' ' ' ' ' '
. . . . . . . . . . . . r. rhodopis (sommerf.) Blonberg & Forss'
7. Apothecia tiny, 0.1 (-0.2) mn diam., with + shining'
utact< margin; exciple earbonaceous black . - . . ' ' ' ' ' '
. . . . . . . o . . . I. granvina Havaas ex P. M. 'Jorg- ingd-
Apothecia larger , 0 . 2-O .6 mm diam. , margf in
ochraceous to du1I bluish black; exciple colourless'
paLebrownishorbluish€Jreen ' ' ' ' ' ' ' ' ' ' ' ' ' 8
8. Blue-green hymenial- pigment N- ' ' ' ' ' ' ' ' ' ' ' '
, . . . . . . . . . . . . .r. suaveoLens (schaerer) Arno]'d
Blue-greenhymenialpigmentN+reddish...... . ' 9
9. Thallus t thin, crustose, sometimes eracked; apothecia
with bluish black margin; on wet acidic rocks
near rivers etc. - - - o . . ' ' I' cyanocatpa (Anzi) Jatta
Thallus either endolithic, pulverulent or t areolate;
apothecia with ochraceous to blackish margini n^
ontdryrcalcargousrocks""..""rv
10. Thallus endolithic; apothecia t immersed in the rock;
spores (10)15-20x8-10pm" " " " ..
oo...........I.melanocarpa(Krempelh.)Arnold
Thallus epilithic, pulverulent to areolate; apothecia
on or partly j-mmersed in the thallus; spores
8-12 x 5-8(10) pm - o . ' I' heteromorpha (Krernpelh') Arnold
Comments to the sPecies
A. Species with brownish apothecia
This is the most diffieult group because there is little variation
in spore-size and pigmentation. Extreme forms are therefore difficult
to identify and obscure the understanding of the taxa '
r. arctica is a good example of these difficulties- some extreme
specimens from the upper geolitteral are more areorate than usual
and approaches I. rhodopis. There is, however, such a strong correlation
between g"rr"t"I morphology' spore size, ecology and distribution,
that i have no doubts about accepting it as a distinct
species, confined to the inundation zone of rivers and lakes in
northern Scandinavia -