LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES 55
Tliallus crustose to squamulose, attached to the substi ate at the centre, hoinoeoinerolls: algae
,\'nnthocapsa; perithecia immersed in the thallus, wall complete, carbonaceous; paraphyses few,
dichotomously branched ; ascospores long ellipsoid to subfusiform, septate, protoplasts cylindric ;
spermatiophores long, sparingly septate aiid branched, spermatia short and small.
The systematic positioii of this genus is doubtful. The perithecial characters are close to
Pot-inu, the habit of the thallus is that of Onrpltalaria Dun. & Gir. in Mont., F1. Alger., 1, 201 ;
1846tS, (ap. Garov., Notizie Nat. e Civ. sulla Lombardia, 1, 336; 1844 noin. nud. l'hy~*~a Mass.,
Flora, 39, 210; 1856) where sterile thalli were first referred by me until perithecia were found.
If one admits the validity of families based on the algal sylllbiont, it clearly belongs in the
Santhopyreniaceae, bearing the same relation to Yo~ina which ,Yunthopy~eniu bears to Arthopyreniu
and Gloeopyrenia to Microgluena.
XANTHOPORINA KERQUELENSIS Dodge, sp. nov.
Typc : Kerguelen, Greenland Harbour, B.A.N.Z.A.R.E. B1774.
Thallus crustosus vel squamulosus, centro affkus, ad 6 mm. diametro, superficie verrucosa
vel cerebriformi, marginibus crenato-incisis, liberis, obscure flavido-viridis madefactus, nigricans
siccitate, ad 200p crassitudine ; ecorticatus ; algae Xanthocnpsa, coloniis cum 2 4 cellulis vaginatis,
cellulis sphaericis, circiter 4p diametro vel majoribus intus ellipsoideis 20 X 10p ; hyphae dichotome
ramosae, tenues, leptodermeae.
Perithecia immersa, sphaerica vel subellipsoidea,. 180-200p diametro, ostiolo minuto, circiter
15p diametro; murus perithecialis integer, carbonaeeo, 15p crassitudine; hypothecium lop crassitudine
hyphis tenuibus dense contextum; asci clavati vel cylindrici, apice crasso juventute, ad
40 X lop ; ascosporae octonae, elongato-ellipsoideae vel subfusiformes [immaturae] , quadricellulares,
protoplastis cylindricis, hyalinis, 10-12 X 3-4p.
Spermogollia sphaerica circiter 180p diametro; murus 35p crassitudine hyphis tenuibus,
leptodermaticis, dense implexum ; spermatiophorae 65p longitudine, pauciseptatae, ramosae ;
spermatia bacilliformia, cylindrica 2 X 0 ~75~.
Thallus crustose to squamulose, attached to the substrate at the centre, margills free, up to
6 mm. in diameter, surface verrucose to cerebriform, margin crenate incised, dark yellow green
when moist becoming black when dry, about 200p thick; ecorticate, but outer layer of gel dark
brown, opaque; algae Xanthocapsa, colonies of 24 cells, in a brownish sheath, cells spherical,
about 4p in diameter, deeply staining the outer portion, the cells larger and less deeply staining
within, ellipsoidal up to 20 x lop; hyphal system dichotomous, of slender, thin-walled hyphae.
Perithecia immersed in the thallus, spherical or slightly ellipsoidal, !80-200p in diameter,
ostiole very small, 15p, in diameter, perithecial wall carbonaceous, 15p thick, completely surroundmg
the thecium except for the ostiole; hypothecium about 10p thick, of deeply staining, tangled
hyphae; asci clavate cylindric, tip thickened when young, about 40 X lop, 8-spored; ascospores
immature but apparently long ellipsoidal to subfusiform, about 4-celled, cells cylindric,
10-12 X Up, hyaline.
Spermogonia spherical, aljout 180p in diameter, wall about 35p thick, of slender, densely
tangled, thin-walled hyphae; spermatiophores about 6 5 long, ~ sparingly septate and branched;
spermatia bacilliform: cylindric, 2 X 0.75p,
The spermogonia are described from sterile material from the Crozet Archipelago.
On rocks with Vermlcak ubfuscata, Pmina insueta) Steiwra glaucella, 8. Werthii) Pannuria
dichroa, Lecideai subdisjungztewh) L. superjecta, Pertusaria cimeraria and P. crozetica.
Kerguelen: upper part of Greenland Harbour, B.A.N.Z.A.R.E. B177-4, type, B177-13,
B20M; Port Jeanne d'Arc, 1,600 ft., B.A.N.Z.A.R.E. B217-1.
Crozet Archipelago : Possession Island, American Bay, B.A.N.Z.A.R.E. B20-3.