LICHENS AND LICHEN. PARASITES

DODGE--LIOHENS AND LICHEN PARASITE8 183
T~IAMNOLECANIA MAWSONI Dodge, Sp. llov
Type: King George V Land, Cape Denison, A.A.E. 15.
Thallus ad 2 mm. altitudine, K-, marginibus lobatis rotundatis, lobis 0.3 mm. longitudine,
ca. 0.5 mm. latituclinc, superficie s~tbcerebriformi, olivaceo-ochracea; cortex 2OP crassitudine,
fastigiato-pseudoparenchymatic~~s, cellulis parvis leptodermeis, crystallis flavo-brunneis iiispersjs,
aut plus minusve decompositns; stratum algarum ad 3 5 crassitudine ~ sub parathecio, inferne
tenuescells et in stipite apothecii evanescens, cellulis 6-7p diametro, conipactis; medulla hyphis
tenuibus irregularibus, ca. 4~ diametro, dense contexta. Apothecia solitaria vel gregaria in
apicibus stipitnm, 0.5-0-9 mm. diametro, disco convexissimo, immarginato, luteo-olivaceo vel
obscuriori; amphithecium non bene evolutnm; palrathecium ca. 35p crassitadine, hyphis tenuibus,
pachydermeis, hyalinis, periclinaliburj, flavidum, plus minusve ci-ystallis margiiie inspersuni;
hypothecinm ca. 2OP crassitudine, hyphis subvcrticalibus, no11 belie distiiictum; thecium 130p
altitudiiie ; paraphyses tenues ; asci cyclindrici ; ascosporae distichae, 2-loculares, leptodermeae,
septo subeccentrico, longe ellipsoideae, 7-8 X 3~. Spermatia c~wvata 10-12 X 0.5~.
Thallus very fragmentary, 2 mm. tall, K-, margin lobed, lobes rounded 0.3 mm. long, about
0.5 mm. broad, surface subcerebriform, olive ochre; cortex 20p thick, a palisade of small-celled,
relatively thin-walled pseudoparenchyma, thickly incrusted with yellowish brown, minute crystals,
more or less decomposed; algal layer up to 35p thick, under the parathecium thinning rapidly
and disappearing along the sides of the apothecial stalk, cells 6-7p i11 diameter, closely packed;
medulla of slender, closely woven, irregular hyphae about 4~ in diameter.
Apothecia occnrring singly or crowded in groups of 2-3 on tips of stalks, 0.5-0.9 mm. in
diameter, disc very convex, immargnate, yellowish olive or darker; amphitheciuni iiot well
developed; parathecinni about 3 5 thick, ~ of slender, thick-walled, hyaline, periclinal hyphae,
yellowish, more or less incrusted with minute crystals at the margin; hypotheciuni abont 20p
thick, of subvertical hyphae, more deeply staining, merging with the parathecium below and the
thecium above ; thecium 130~ tall ; paraphyses slender ; asci cylindric ; spores distichous, %celled,
hyaline, thin-walled, septnm somewhat eccentric, long ellipsoid, 7-8 X 3p. Spermatia long,
curved, 10-12 X 0.5p.
Most of the apothecia sectioiied are old and gelified, the asci collapsed and oiily a few spores
seen, several germinating in situ. Spermogonia were not clearly seen, but in one old thallus, old
ones still contained a few long, curved spermatia 10-12 X 0.5p.
On red and grey granite with Heppia amtarctica, Toninia Johnstoni aiid Untbilica.riu Hzcnteri.
King George V Land, Cape Denison, A.A.E. 15,103-2,123,167.
Candel~riella~
Mull.-Arg., Bull. Herb. Boissier, 2, app., 1, 11 ; 1894.
The type species is Candelariella viteilina (Ach.) Miil1.- AT^.
Thallus crustose, uniform, horny, verrucose or effignrate (sect. Ca!oplucqpsis), bright yellow
not colonred red by KOH, attached to the substrate by hyphae of the prothallus or of the medulla,
without rhizinae, heteromerous; with Protococcus. Apothecia sessile, circular, yellow, not coloured
red by KOH, lecanorine; hypothecinm hyaline with algae below; paraphyses unbraiiched, non-
septate or septate near the tip; asci 8- to many-spored; ascospores hyaline, elongate to ellipsoidal,
1-2-celled with thin septum and walls. Spermogonia very small, punctiform, yellow,; sperinatio-
phores scantily septate, forked or branched, short; spermatia short, straight.