LICHENS AND LICHEN. PARASITES

DODGE-LICIIENS ANL, LICHEN PARASITES
TIHROM~IUM KERGUELANUM Dodge, sp. nov.
Typ(3 : ICwguelen, near Port Jealllle d'hrc, 1,400 ft., B.A.N.Z.A.R.E. R200-1.
Thallus tenuis, circa 180p crassitudine, dilute brunneo-olivaceus vel isabellinus, margille laevi,
ocllroleuco ; ecorticatns ; algae palmelloideae, cellulis subsphericis, irregulariter distributis, 7-8/*
(liilmetro. Perithecia immersa, hemispherica, deinde subspherica, circa 150p diametro (muro
c)sclnso), ostiolo 354Op diametro, lion prolni~lente ; murus pmithecialis circa 7 5 apice ~ lateribusque,
illfl.a acl .Xi/* tenuescens, pseudoparenchymaticus, carbonaceus; hypothecium 15-2OP crassitucline,
]~~~llis teiluissimis dense coiltextum, 11011 m~~lto in lateribus extensum ; periphyses partem dimidiam
hl~pel.iorcm perilhecii tcgentea, abu~idanter septatae, pauciramosae, cellulas subsphaericas abj~ulgentes;
paraphyses persistentes, tennes, hyalinae; asci cylindrici, evanescelltes; ascosporae octonae,
hyalinae, unicellulares 7-8 X 3 ~54~.
Thallus thin, about 18OP thiclr, determinate, light brownish olive to isabdline with a honey
yellow, smooth margin; ecorticate; algae palmelioid, cells subspherical, irregularly arranged,
7-8p jil diameter with large irregular masses of dark fuscous to black tissue appmently of densely
woven slender hyphae (not pseudoparenchymato~~s as in Verruralriu u~ethioboliza Nyl.).
Perithecia immersed, hemispherical at first becoming nearly spherical, about 150p in diameter
(inside the perithecial wall) ; ostiole 3SOp in diameter, not prominent, surrounded by an area
about 200r in diameter not covelsed by thallus ; perithecial wall about 75p thick on top and sides,
thinning to 55p below, pseudoparenchymato~is, carbonaceo~~s ; hypothecium 15-2OP thick, of very
slender densely woven hyphae, hyaline, iiot extending much up the sides of the perithecium;
periphyses lining the upper half of the perithecium, abundantly septate, little branched, cutting
off subspherical cells; paraphpses persistent, slender, hyaline; asci cylindrical, &spored, early
evanescent; ascospores hyaline, ~ulicellular, 7-8 X 3 .54~.
Growing with Mykoblastzcs stephandes and Pllllcopsis bicolor.
Kerguelen : near Port Jeanne d 'Arc, 1,400 ft., B.A.N.Z.A.R.E. B200-1; Observatory Bay,
13.A.N.Z.A.R.E. B192-9.
l'helidium Massalongo, Framm. Lich., 15; 1855.
Phrccgnwthele Clements, Gen. F~ulg., 39 ; 1909.
THELIDIUM Massa1.
The type species was not designated. Of the seveil species origiiially tralisferred here,
Clements and Shear (Qen. Fuilg., 288 ; 1931) chose T. antyluceun~ Mass. Phragnbothele was based
on P. papulare (Fr.) Clements.
Thallus crustose, simple, ecorticate, p~orly developed and often the perithecia sessile to
imirlersed in the crustose thallm of other lichens ; algae Protococcoid ; perithecium simple, horny, to
carbonaceous ; paraphyses early gelified and evanescent ; asci saccate, 8-spored ; ascospores ellipsoid
or ovoid, hyaline or brown,-2-4-celled, commonly with large oil droplets.
Various attempts have beell made to separate the free-living from the epiphytic and parasitic
species, but until we have a monographic treatment of the whole group, it seems best to leave them
in Thelidium.
THELIDIUM PRAEVALEGCENS (Nyl.) Zahlbr.
Thelidium praevubescens (Nyl.) Zahlbr., Deutsche Siidpol'ar Exp., 8,51; 1906.
Verrzwia praevalescens Nyl. in Crombie, Jour. Linn. Soc. Bot., 15,192 ; 1876. Phil. Trans. Roy.
Soc. [London], 168, 52; 1879. Rept. Sci. Results Voy. "Challenger" Bot., 1, 2,'240; 1885.
Type : Kerguelen, Observatory Bay and hill north-west of Mt. Crozier, A. E. Eaton (Venus
Transit Exp.).