LICHENS AND LICHEN. PARASITES

154 B.A.N.Z. ANTARCTIC RESEARCIi EXE'EDITION
slenderer hyphae throughout the thallus, but its algae are clearly Trentepohlioid, and it does not
seem to be related to Rinodinu. nor the Physciaceae.
Queen Mary Land : Possession Nunatak, C. T. Harrisson, A.A.E. 56-1.
Thallns little developed, crustose, squamulose or dwarf foliose, homoeomerous or heteromerons,
attached to the substrate by the hyphae of the medulla or the prothallus, or by a ceutral strand i11
Glypholechia, without rhizinae; ecorticate or more or less corticate; with protococcoid algae.
Apothecia immersed in thalline warts, sometimes nearly perithecioid, sessile or short stipitate,
single or crowded, with a circular or somewhat irregular disc, biatorine, lecideiile or lecai1oriile ;
asci polysporous ; ascospores very small, usually unicellular, 2-celled in Maronea, with thin walls
and without sheaths.
Only Acarospora, the largest and most widely distributed genus, has yet been found in our area.
ACAROSPORA Mass.
A.carospora Mass., Ricerche Autonom. Lich. Crost., 27 ; 1852.
Nuriospom Naeg. in Hepp, Flecht. Europ., no. 57; 1853.
Type : R?Iassalongo originally listed Urceolaria Schleicheri Ach., Lecanora chlorophana Ach.,
L. otyt~ovla Ach., Lichen cervinus Pers., Endocarpon smaragddunt Wahl. in Ach. end A. verotievlsis
Mass. Since the yellow species are sometimes segregated, the type should be chosen from the brown
species. Nyriospora was based on M. Heppii Naeg.
Thallus crustose, uniform or effigurate, areolate, cortex appearing pseudoparenchymatons,
outer portion usually decomposed ; alga Cystococcus; medulla well developed, lower cortex thin.
Apothecia immersed, solitary or several in the same areole with a small, round or irregular disc,
surrounded by the thallus ; parathecium usually present ; hypothecium hyaline, resting on the algal
layer ; thecium gelified ; paraphyses usually sparingly branched, tips often swollen to capitate ; asci
polysporous; ascospores small, hyaline, unicellular, thin-walled; spermogonia immersed, ovoid,
with hyaline wall, often folded ; spermatiophores eseptate ; spermatia ellipsoid, small.
ACAROSPORA KIDDERI Dodge, sp. nov.
Lecidea fuscoatra Tuck., Bull. Torrey Bot. Club, 6, 59 ; 1875 : Bull. U.S. Nat. Mus., 3, 30 ; 1876
non Ach.
? Lecanora molybdina Hook f., Cryptog. Antarct., 230; 1845: F1. Antaract., 2, 536; 1847 lion Ach.
Type: Kerguelen, Molloy Point, J. H. Kidder (U.S. Transit of Venus Exp. on rock with
"BuellGz geographica" in Tuckerman Herb. sheet 3,273 at Farlow Herb.).
Hypothallus continuus, tenuis, niger, margine sublobato sed non fknbriato ; areolae assimila-
tivae avellaneae vel castaneae, innatae inter crustam non-assimilativam, minus quam 0-5 mnl.
diametro ; cortex amorphus 20-50p crassitudine ; stratum gonidiale 90p crassitudine, cellulis pro-
tococcoideis 4-5p diametro ; medulla circiter 35p crassitudine hyphis verticalibus laxe contextis ;
cortex inferior tenuis aeruginosus. Apothecia innata, marginibus subelevatis, disco plano vel
convexiusculo, nigro 0-7-0.8 mm.; parathecium non evolutum; hypothecium 30p crasstitudipe,
hyphis tenuissimis dense contextum; thecium 150-160p altitudine; paraphyses tenues, flexuosae,
anastomosantes, cellulis 2-3 superioribns ellipsoideis 4-5@ diametro, aeruginosis vel fuliginosis,
pachydermeis, gelatina epitheciali 7-8p crassitudine; asci late ovoidei, pachydermei 55 X 30p;
ascosporae immaturae, hyalinae 4 X 1p.