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26 1<br />
B.A.N.Z. ANTARCTIC RESEARCH EXPEDITION<br />
Perithecia immersed in the thecinm of the host; wall about 20p thick, hyaline below, shading<br />
to dark brown and much thicker above; paraphyses slender, unbranched, tips free, acute; asci<br />
broadly clavate, 8-spored, about 35 X 15:~; ascospores brown, 2-celled, narrowly ellipsoidal to<br />
oblong, 15-16 X 45p, upper cell slightly larger, walls moderately thickened, slightly constricted<br />
at the septum.<br />
On Pyrenodesnzk inclinuns (Strtn.) Dodge.<br />
This species differs from the related D. Ifuttlinrjeriae from Kerguelia in larger, thicker-<br />
walled perithecia, more numerous and broader asci and slightly larger ascospores. Unfortunately,<br />
the only material seen was in a crushed preparation, where the delicate lower portion of the peri-<br />
thecium was so disorganized in crushing that exact measurements of the perithecia are impossible,<br />
but judging from the much larger number of asci and the greater dimensions of the blackened<br />
upper portion of the perithecium, the perithecia are much larger than those of D. Zluttlingeriae.<br />
Macquarie Island : Featherbed Flat, B.A.N,Z.A.R.E. B533-7.<br />
Perithecia immersed in the thecium of the host, oblong, about 95p tall and 35p in diameter;<br />
wall about 8p thick, of periclinal thick-walled, closely septate, brown hyphae, much thickened and<br />
blacker above about the very small ostiole ; paraphyses present ; asci cylindric; ascospores not seen.<br />
On thecium of Lecidea Werthii Zahlbr.<br />
Heard Island: vicinity of Corinthian Bay and Atlas Cove, B.A.N.Z.A.R.E. B1404.<br />
CELIDIACEAE.<br />
Phacopsis Tul., Ann. Sci. Nat. Bot. IIT.? 17, 124; 1852<br />
Type: Originally based on P. Clentens, P. varia and P. vulpina. Massalongo transferred:<br />
P. Clemens and P. varia to other genera leaving P. vulpina as the type.<br />
Apothecia cespitose, immersed at first, erumpent and finally sessile, disc flat then convex,,-<br />
parathecium undeveloped ; asci ovoid, thick-walled, 8-spored ; ascospores long-ellipsoid, unicellular;<br />
hyaline; hypothecium brown ; paraphyses branched, tips enlarged and black.<br />
PHACOPSIS USNEAE Dodge, sp. nov.<br />
Type: Kerguelen, Mt. Wyville Thompson, 1,000-1,500 ft., B.A.N.Z.A.R.E. B246-21 on Usneu<br />
trachycarpa (Stirton) Miill.-Arg.<br />
Stromata nigra, ca. 1 mm. diametro; hyphis brunneis ca. 7p diametro, contortis et laxe con-<br />
textis, stratum algarum hospitinm penetrantibus; stroma ca. 225p crassitudine, hyphis verticali-<br />
bus, conglutinatis ; parathecium deest ; thecium 55,u altitudine ; paraphyses pachydermeae, 4p<br />
diametro, apicibus non incrassatis, conglutinatae, brunneae, septatae; asci 4045 X 15-18p,<br />
ellipsoidei, hyalini ; ascosporae octonae, hyalinae, uniloculares, fnsiformes, 10-12 X 4p pachyder-<br />
meae.<br />
Stromafa appearing as black circnlar spots about 1 min. in diameter on the surface of the larger<br />
branches of the host, hypae dark brown, about 7p in diameter, contorted and loosely woven,<br />
penetrating to the algal layer of the host, more dense above and forming a stroma about 22$ thick;<br />
consisting of vertical conglutinate hyphae, parathecium absent ; thecium 55p tall, paraphyses thick-<br />
walled, 4p in diameter, tips not thiclwned, conylntinate, brownish, septate; asci 40-45 X15-ltjP,<br />
ellipsoidal, 8-spored, hyaline ; ascospores hpaline unicellnlar, fusiform. 10-12 X 3 .54p, thick-<br />
walled.<br />
Kergnelen, Mt. Wyville Thompson, 1,000-1,500 ft., B.A.N.Z.A.R.E. B246-21.
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