LICHENS AND LICHEN. PARASITES

DODGE-LICHENS AND LICHEN PARASITES 229
differentiated ; thecium 110-120~ tall, bluish green ; paraphyses eleucler, flexuous. not densely
packed, tips not enlarged, ending in the greenish black epithecial gel; asci narrow clavate,
50-55 X 7-8p, &spored ; ascospores polari-bilocular, ellipsoidal, hyaline, 7-8 )( 2-3~.
The abundant rock crystals have prevented cutting good sections of the thallus; the material is
meagre and fragmented, and the apothecia are old, with almost no youne asci, very few mature asci
and ascospores. It may even be parasitic on an old w~athered Po!ycauliona sp., but it is certainly
not a Sct~tz~lu and is close in apothecial structure and spores to Htten. The spores are slightly
smaller than in Hueu flaw Dodge & Baker, the thecium is much taller and inore deeply coloured
The colour gradually fades in lacto-phenol.
A.A.E. 6-2 from the type locality seems to be a younger stage, agreeing well in measurements
Very few of the asci have differentiated spores. The algae are better developed, cells 10-12,~ in
diameter, with suggestion of a fastigiate cortex 50p thick, of branched hyphae about 4p in diameter,
highly gelified. The more coinpact white thallus has included so many crystals of sand, that it is
very difficult to secure satisfactory sections.
Queen Mary Land: Mt. Barr-Smith, ca. 4,000 ft., C. T, IIarrisson, A.A.E. 6-2, 10-2, 80.
PYRENODESMIA Mass:
Pyt-e?~odestr~iu Mas., Atti I. R. 1st. 1-eneto 11, 3, 119; 1858.
(lrrllopisn~a DNtrs., Giorn. Bot. Ital. 11. 5, 198; 1847. non Martins, 1827 (Gentianaceae).
CaEoplacu Th. Fr., Lich. Arctoi, 218 ; 1860.
Type: For discussion see Dodge & Baker. Ann. Mo. Bot. Gard., 25, 619 ; 1938.
Thallus crustose, attached to the substrate by the hyphae of the prothallus or of the medulla,
without rhizinae, uniform, mostly yellow and K purple; heteromeroue, ecorticate or nearly so;
algae protococcoid; medulla arachnoid, of thin-walled hyphae. Apothecia round, appressed or
sessile, seldom immersed, lecanorine with a well tleveloped amphithecium containing cortex, algal
layer and medulla; epithecium granulose to powdery, usually I( purple or violet; hypothecium
hyaline, lying above the algal lager; paraphyses simple, septate, capitate; asci 5-spored; aseo-
spores hyaline, ellipsoidal to fusiform, usutllly polari-bilocular, cells often connected by an isthmus.
Spermogonia immer~ed, with a hyaline ~vall; ~permatiophores closely septate; spermatia short
straight, cylindrical.
P.YRENODESMIA KERGUELENSIS (Bouly de Lesdain) Dodge, comb. nov.
Cnloplnca. kerguelensis Bouly de Lesdaili. Ann. Crypt. Exot., 4, 101 ; 1931.
Type : Tcerguelen, Port Jeanne d'Arc. Aubert de la Riie 10.
Thallus very thin, somewhat riinose, smooth, shining, aniline yellow, indeterminate, margill
thin and irregular, growing over other lichen thal li ; cortex about 30~ thiclr, more or less fastigiate,
with abundant brownish crystals in the outer 10p; algae protococcoid, cells spherical np to 15p i11
diameter.
Apothecia sessile, coi~stricted at the base, about 0.2 mm. i11 diameter, margin thick, slightly
elevated, disc concave; ampliithecinm abont 150p thick, 'cortex 75~, similar to that of the thallas
but thicker; algal layer 73p thiclr, of closely j~acked cells and very few hyphae; paratheciuin
60-120p thick, of gelified subvertical hyphae, forming a cone below the hypothecium which is about
35p thick, of slender, densely woven, deeply staining h-vphae ; theci~un about 75,~ tall ; paraphyses
slender, eseptate, forked and monilifornl above the asci heaGily incrusted with yellow brown crystals,
forming an epithecium 15-20p thick; asci clavate, thin-walled at maturity, 55-60 X 10-12p,
8-spored; ascospores hyaline, polari-bilocull-lr, ellipsoidal, 12-16 X 67p.