LICHENS AND LICHEN. PARASITES

DODGLLICHENS AND LICHEN PARASITES 239
Laseron, A.A.E. 25-7; Cape Denison, A.A.E. 1, 24, 42, 95-2,' 1024, 104-4, 183, 184, 185;
B.A.N.Z.A.R.E. 53&7, 536-29, 536-42; Mt. Murchison, 1,860 ft., A. L. McLean, A.A.E. 39.
Queen Mary Land: Possession Nunatalr, C. T. Harrisson, A.A.E. 42 type, 44; Hippo N1111~-
tak, C. T. Harrisson, A.A.E. 74; Mt. Barr-Smith, ca. 4,000 ft., C. T. Harrisson, A.A.E. 75-11.
POLYCAULTQNA JOHNSWNI Dodge, sp. nov.
Type : MacRobertsoii Land, Cape Bruce, B.A.N.Z.A.R.E. B108-28.
Thallus, fruticnlos~ls, 2 mm. altitndine, teres vel snbapplanatns, miniatus; cortex 35p
crassitndine, fastigiatim pseudopareilchymaticns, cellulis 4~ dAametro, pachydermeis, exteris
crystallis flavo-brnnneis inspersis ; stratum algarum 75-100p crassitudine, coloniis discretis, cellnlis
sphaericis snbangulosisve, 15-18p diametro; mednlla laxissime contexts, hyphis ramosi~
anastomosantibnsque, leptodermeis, ca. 4p diametro. Apothecia termiiialia, ad 1.5 mm. diametro,
disco plano, convexinscnlo, miniato vel obscuriori, margine laevi ; parathecinm inferne 20p crassitndine,
ad 75p snperne, hyphis periclinalibus, conplutinatis; hypothecinm ca. 15p crassitndine,
non bene distincturn ; thecium 40-45p altitudine ; paraphyses 3p diametro, pachydermeae, septatae,
apicibns clavatis, crystallis bruilneis inspersae ; asci late clavati, apicibus incrassatis, protoplastis
mamillatis; ascosporae hyalinae, polari-bilocularibns, ca. 10 X 5p.
Thallns d~varf frnticose, 2 mm. tall, very fragmentary, but apparently i11 low pnlvinate tnfts,
very variable in form, from ronnd to flattened and subcerebriform, flaine scarlet in exposecl portions
to lemon chrome in shaded portions ; cortcx 35p thick, snbfastigiately psendoparrnchymato~~s
cells thiclr-walled, variable in size (many abont 4p in diameter), onter 6-7p heavily incrusted
with minnte yellowish brown crystals ; algal layer 75-100p thiclr, of discrete colonies, protococcoicl,
cells spherical to somewhat angular, 15-18p in diameter; mednlla very loosely woven to arachnoid,
of cnrved, branched and anastomosing hyphae, about 4p in diameter, relatively thin-wallecl.
Apothecia terminal on upright members of the thallns, up to 1.5 mm. in diameter, disc flat,
or somewhat convex, Mars orange or somewhat darker, margin smootn, concolourons with the
thallus, level with the disc but often showing a distinct groove on the ontside where it joins the
thallns (apothecia essentially replacing the thalline cortex at the top of the stalk) ; parathecituli
not differentiated from the medulla below the hypothecium except somewliat more compactly
woven, toward the sides the medullary hyphae become increasingly periclinal and conglntiiiate,
forming a hyaline parathecium about 20p thick at the base of the thecium, spreading fanwise
upward to 75p, the outer 30p heavily incrusted with brownish crystals; hypothecium abont
thiclr, deeply staining, closely woven, not sharply differentiated from the parathecium below ant1
the thecium above ; thecinm 40-45p tall ; paraphyses 3p in diameter, thick-walled, septate, lumen
abont 1p in diameter, tips clavate, cutting off a spherical cell 4p in diameter, heavily incrnsted
with brownish crystals in the upper lop; asci broad clavate, tip thickened, protoplast longmamillate,
30 X 8p; ascospores hyaline, polari-bilocular, abont 10 X 5p.
King George V Land : Cape Denison, A.A.E. 186.
MacRobertson r~and : Cape Bruce, B.A.N.Z.A.R.E. 108-28, type.
BUELLIA C u
Thallus crnstose to squamose, simple or effigurate, without rhizinae, attached to the substrate
by the hyphae of the prothallus or of the medulla; cortex variable, evanescent in some species;
algae protococcoid; medulla loosely woven, of thin-walled hyphae. Apothecia rolund, immersed
or sessile, lecideine or lecanorine; paraphyses simple or branched; asri normally 8-spored ; nsco-