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DODGE-LIUHENS <strong>AND</strong> <strong>LICHEN</strong> <strong>PARASITES</strong><br />
PYRENULBCEAE.<br />
Thallus crustose, uniform, epi- or endophloedal, rarely epilithic, ecorticate, algae Trantspohlicr.<br />
Perithecia single or crowded, erect, with vertical ostiole. Spermatia us~~ally exobasidial.<br />
This family is predominantly tropical and in need of revision, especially in its relations with<br />
thc Trypetheliaceae (see Johnston, G. T. 1940. Contribntions to the study of the Trypetheliaccac.<br />
.\IIII. JZissonri. Bot. Card., 27, 1-50; pl. 14.). All the genera so far found in our region belong<br />
to the group of genera with cylindric cells in the spores, rather than to the group with lentiforin<br />
cells, unless Porina inr?~etn he transferred to Y!!rc1qzw.'n on acco~ui~t of its thiclr-walled spores nvith<br />
~ound protoplasts.<br />
Pai.aphyses branched and reticulately anastomosing, soon gelifying and evanescent<br />
Spores 2-celled, hyaline with a thick septum, uniseriate . , . . ' Acrocordia<br />
Ascospores 2-6-celled, brown, cells variable in shape, not clearly uniseriate Microbhelk<br />
Paraphyses unbranched and free<br />
Ascospores unicellular, wall rather thick . . . . . . . . Coccotremtr<br />
Ascospores 4-celled, protoplasts cylindric . . . . . . . . . . Porinn<br />
Perithecia nearly covered by the thall!rs . . . . . . sect. Segestrirt<br />
Perithecia not covered by the thallus . . . . . . . . sect. Sngrdin<br />
Acrocmdia, Mass., Geneac. Lich., 18; 1854.<br />
Arbhopyrenin sect. Acrocordia Mull.-Arg., Mkm. Soc. Phys. Hist. Nat. GenBve, 16, 428; 1862.<br />
Sageclia sect. Acrocordia Stzbgr., Ber. Thatigk. St. Gallisch. Naturw. Ges., 148; 1862.<br />
Verr?tcaria subg. Acrocordia Harm. & Claud., Guide Elkment. Lichknol., 77 ; 1904.<br />
Type: This genus was based on A. g:rnnlatn and A. Garmagli.<br />
Thallus crustose, uniform, thin, ecorticate, mostly homoeomerous, endophloedal, rarely rpi-<br />
lithic, algae Trentepohlia. Perithecia single, semi-emersed or immersed, conic or hemispheric,<br />
wall carbonaceous, with a central ostiole; paraphyses persistent, branched, anastomosing; asci<br />
cylindric, usually 8-spored; ascospores ellipsoidal to oblong, uniseriate in the ascus, lvitli two<br />
cells of equal size separated by a broad septum, hyaline. Spermogonia small, spherical, dark<br />
coloured ; spermatiophores simple, spermatia bacilliform to cylindric.<br />
ACROCORDIA PLATYSEPTATA (Zahlbr.) Dodge, n. comb.<br />
Arthopyrmia platyseptata Zahlbr., Deutsche Siidpolar Exp., 8, 31 ; 1906.<br />
Type : Kerguelen, Observatory Bay, Werth (Deutsche Siidpolar Exp.) .<br />
Thallus epilithic, very thin, small, irregular, more or less confluent, continuous, smooth,<br />
olivaceous, blackening, somewhat shining; K-, Ca-; ecorticate, homoeomerous with slender, rather<br />
indistinct medullary hyphae, I-; algae Trentepohlia, cells &16p in diameter, pale green with n<br />
thin membrane. Perithecia minute, 150-200p in diameter, sessile, scattered, black, shining, not<br />
covered by the thallus ; perithecial wall depressed hcmispheric,'black on the top and sides, hyal-<br />
ine below, ostiole small ; paraphyses soon evanescent ; thecium I vinose reddening ; asci ovoid to<br />
oblong, tips not thiclrened, 26-35 X 10-13p, 8-spored ; ascospores obliquely biseriate, hyaline,<br />
oblong to ellipsoid oblong, ends ronnded, straight or slightly curved, 2-celled, the very thick sep-
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