LICHENS AND LICHEN. PARASITES

62 B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION
The above spore nieasurements may be rather low as I have been unable to find spores free from
the ascns in my scanty material. Without seeing the specimeiis upon which Crombie based
his cietermination the citation of Lecidea antylacea from Kerguelen is doubtful, as that name
has been applied to various species by different authors. Nylander, upon whom Crombie relied for
most of his determiliatiolls of exotic lichens, is said to have used it for species now placed in
Lecanactis.
On rock with Lecidea phaeostonta, Rhizocaapon kerg?c.elense and Psrtusa.ria cineraria.
Kerguelen : npper end of Greenland Harbour, R.A.N.Z.A.R.E. B177-16.
IAECANACTIS MAWSONI Dodge, sp. nov.
Type : Kerguelen, Observatory Rap, R.A.N.Z.A.R.E. R192-12.
Thillli~s tennis, rimuloso-areolatus, determinatns, margiiie tenui, non lobatus, probabiliter
obsci~re olivaceo-lutens, sed fere totus ochraceo-fnlvo in typo tinctus, ecorticatus; algae Trentepohlia,
filameiitis verticalibus 7-8p diametro. Apothecia solitaria, sessilia, nigra, disco convexo,
margiiie crennlato; parathecium carbonaceum, 180~ crassitndine 11011 sub hypothecio; hypothecilim
hyalinum, 150p crassitudine, hyphis snbverticalibns, tennibns ; thecinm 110-120p altitudine ; paraphyses
tenuee, ramosae anastomosantesque, epithecium carbonaceum 50-75p crassitudine formantes;
asci cylindrici vel subclavati, leptodermatici, 70-75p longitndine; ascosporae octonae,
hyalinae, fusiformes, 4-loculares, 18-20 X 5-6p.
Thallns thin, rimulose-areolate, determinate, margill thin, not lobed, probably deep olive buff,
but type uniformly stained ochraceous tawny over most of the surface; ecorticate but upper lop
of the thallus nearly opaque from a dense mass of yellow~ish brown crystals; algae Trentepohlia,
of vertical filaments 7-8p in diameter, breaking up illto single cells below, among the rock crystals.
Apothecia solitary, sessile, carbonaceous, disc convex, margin crenulate, finally appearing as
a ring of hemispheric black warts surrounding the hemispheric blaclr disc ; parathecium carbonaceous,
180~ thick, not extending below the thecium; hypothecium hyaline, 150p thick, of subvertical,
densely woven, very slender hpphae, deeply stainiiig aiid resting directly on the algal layer;
thecium 110-120~ tall; paraphyses slender, branched and ailastomosing to form a carbonaceous
epithecinm 50-75p thiclr with dense masses of ochraceous crystals; asci cylindric to slightly clavate,
thin-walled, 8-spored, 70-75p long; ascospores hyaline, fusiform, 4-celled, 18-20 X 5-6p.
This species differs from others so far referred to Lecanactis in the absence of parathecium
below the hypotheciuni, much as the group of species ceiiteriilg around Lecidca Aliberti differs
from the rest of the species of Lecidea in Kerguelen.
On rock with Ledea Mawsoni.
Kerguelen: Observatory Bay, B.A.N.Z.A.R.E. R192-12.
GYALECTACEAE.
Thallus crustose, homoeomerous or heteromerous, uniform or rarely with lobate margins;
ecortichte with Trentepohlk or ~h~ll&ti&um algae. Apothecia circular, immersed to sessile;
ilmphithecium either present or absent; parathecium thin and light coloured or carbonaceous;
peraphyses slender, 1itt.le branched ; asci 6-many-spored ; ascospores hyaline, thin-walled.
Only Ionnspis has yet been foiind in our area.
lonupis Th. Fries, Lich. Scand., 1,' 273 ; ,1871.
IONAPSIS Th. Fries.
Type: Aspieilia chrysophona KSrb., A. rhodopis.Smrflt., A. odma Ach., A. suave ole^ Ach.,
A. haematina Korb., A. cyanocarpa Anzi, A. epuZotica Am., A. cinereorufescens v. heteromorpha
Kremplh. were originally included. A. chrys~han,a KSrb. is a confusion of A. odora and A.