LICHENS AND LICHEN. PARASITES

DODGELICHENS AND LICHEN PARASITES 241
t Lecidea myriocarpa Crombie, Jour. Linn. Soc. Bot., 15, 190; 1876: Jour. Bot. Brit. For., 15,
106, 1877 ; Phil. Trans. Roy Soc. [London], 168,51; 1879 : Rept. Sci. Res. Voy. " Challenger"
Bot., 1, 2, 239; 1885.
Type: Kergnelen, Royal Sound, Observatory Bay and Swain's Bay, A. E. Eaton (Venue
Transit Exp.).
Thallus variable from very thin, almost obsolete, conforming to the surfaces of the rock
crystals, to moderately thick, rimulose areolate, mostly greyish olive to olivaceous black, margin
indeterminate, very thin; cortex 12-15r. thick, of thick-walled isodiametric cells, the outer some-
\
what brownish, finally decomposed and hyaline; algal layer about 75p thick, cells protococcoid,
arranged in more or less vertical rows between the medullary hyphae; medulla of loosely woven,
very thick-walled hyphae, inclosing many rock xrflals.
Apothecia from semi-emersed to sessile at maturity, black, disc concave, margin elevated,
smooth, becoming sublobate-crenate, then angular, and from proliferation of new apothecia from
the old disc, irregularly gyrose or chiodectonoid ; amphithecium absent ; parathecium quite variable
in thickness below (depending on the amount of proliferation) (60-) 90-110 (-180 or more) p,
somewhat thinner laterally, carbonaceous ; hypothecium not differentiated from the thecium ;
thecium about 70-9OP tall, in well developed apothecia; paraphyses slender, dichotomous above
the asci, tips clavate, covered by a spherical cap of dark crystalline material ; asci clavate to
subcylindric, walls only slightly thickened when young, 55--60 X 10-12r., 8-spored; ascospores
brown, bilocular, broadly ellipsoidal, thick-walled, not or only slightly constricted at the septum,
14-18 (-22) X 7-8 (-1O)p.
This widespread and somewhat variable species of the Kerguelen Region is readily recognized
by its proliferations, irregular apothecia with horizontal rather than vertical ridges on the exciple.
Some sections of proliferating apothecia are suggestive of Entephalogrcbpha cerebrinella which
has smaller spores and usually a few algae between the parathecia.
I did not find the specimens on which Tuckerman based his report of R. parasema, but froin
his interpretation of that species in other 'publications, it seems probable that his report should
be referred here. It seems likely that specimens with a very thin or evanescent thallus from
Swains Bay, A. E. Eaton (Venus Transit Exp.) referred by Crombie to Ruellia myriocarpa also
bhlonP he~e. The latter name has been osed by various authors to cover different entities, but
if A. L.)(~mith followed Crombie's tradition, the spore size wol~ld be somewhat intermediate
br&ke$' B. szlbplicata and Encepha!qrapha cerebrinella.
Op rocks with Verrucaria Werthii, The1ido:in.~ heardense, T. pramalesoens, Phyllopyrenk
tessellata, Encephdographa cerebrine!la, Ionaspis kerg~celenmi, Pannaria dichroa, Lacideu
Auberti, L. Eatoni, L. phaeostonza, L. subdisjumguenda, L. ~ubplana~, L. superjecta, L. Werthii,
Catillaria kerguelensis, Rhizocarpon Joltnstolii, R. kergueleme, R. Mawsoni, Thdloidinza
kerg~~elelzsis, Pertusariu cineraria, P. kerg.zieleasis, P. ochrolechioides, P. subperrinzosa, Aspicilia
d.isjungliend&, A. endochlora, A. lygon~ma, Lecanora afrocaesia, Aspiciliopsis n~acrophthalnca,
Lecamia heardensis, Blastenia Johnstmi, B. kcrgzielensis, Kuttlingeria crozetica, Pyrenodesntia
vitellinella, Buellin trislizcsculn and Rinodina aspicilim.
Crozet Archipelago: Possession Island, American Bay, B.A.N.Z.A.R.E. B20-8, B20-16,
B20-18, B20-19, B20-23, B20-24.
Kerguelen: Royal Sound, B.A.N.Z.A.R.E. B90-4, B90-5, B90-8, B90-10, B90-12, B90-15,
B90-16, B90-21; Greenland Harbour, B.A.N.Z.A.R.E. ~177-14, B177-27, B177-34, B177-35,
B177-38, R177-39, B17744, B177-47, B17748, B17749, B177-53, B177-62, B177-63, B177-64,