DISCOVERY REPORTS 

 Tection about 4^0/. dmm., with entirely brown-blackish wall 25^35 /' thick, and covered to the base by 

 a massiVe carbonaceous involucrellum 75-00, thick which fuses with the hypothallme tissue below 

 Periphyses indistinct. No paraphyses. Asci clavate, 50-65 x 12-zo/., with colourless gel-tmous wall 

 up to la thick. Spores 8, irregularly biseriate in ascus, with granulose contents and wall abou 0-7/^ 

 thick ellipsoid or occasionally broadly ellipsoid, i5-o-i6-5 x 9-1 1 A- Pycmdia indicated externally by 

 non-prominent, black, round or slightly elongated, ring-like spots about 0-15 mm. diam., compound^ 

 consisting of several flattened intercommunicating chambers with colourless walls 6-9/^ hick; ostiole 

 surrounded by carbonaceous tissue. Fulcra exobasidial, simple. Pycnoconidia baciUar, straight, 



^' Chemicd'relcdons : surface of thallus and medulla KHO- (or brownish), CaCUO,-, KHO(CaCl,0,)-, 

 C H.(NH,Y,-. Hvmenial gelatine pale wine-red with iodine. ., t^t 1 



" L:L»/belongs \o ,he section Li,hoicea and appears ,„ be related to V. ca>alep,o,M Nyl. 



Verrucaria serpuloides M. Lamb, n.sp. (F,g. ^e; PI. I, fig. 2; PI. II, fig. . ; PI. IV, fig. 8) 



West Graham Land. Palmer Archipelago: Port Lockroy, Goudier Islet; on granod.or.te rocks west 

 of the boat harbour, below the level of the lowest spring tides and therefore pennanently submerged; 

 FIDS zy.viii. 1944 (no. 1250 />!■. />.); 19.x. 1944 (nos. 1321, 1322). 



East Graham Land. Trinily Pmnmda, south coast: Hope Bay; in rock pool just below low-water 

 mark on occasion of low spring tides ; F.I.D.S., 21. xi. 1945 (no. 2565, holotype). 



Description. ThaUm epiUihicm, piceo-niger {parlihus Icnmbus olivaceo-mgricans), effusus, umforrnis, 



substratum late tcgcs, contiguus, ad 0-5 mm. crassus. ambttn tenuior et haui zmato-crcumscrtpus; 



contiZ lacvigaL, ub,.UiL, statu madefacto sat gclalinosus, strata basali huudful.g,noso;gonui.aaete 



ZZ ghbosa compressa^e, 6-o(^,a), dtam., seriebus vertualibus per totant crassttudtnem thall. 



Zl / Perithecasa, numerosa, sparsa, thallo iumersa, aptce i,nvolucrello) bene prommenU tum.do- 



tilri .el truncato-subconico. atro, saepe nUido, 0.30^0.45 -■ *-■■ ^"'^""^'tir "o'o T3 . 



ccmcavo-mpresso; poro central! semper conspdato, 0.03-0.06 mm la,o E.c,pulum .**«y. 3°°-« ; 



Mam., 3<^4S 1. crassum.basi lateribusque incoloratum. superne cum mvolucrello carbonaeeo 60-. .5 /- rrajso 



tloumZd producto confluens. Paraphyses ntdlae. Asci cla.a,i aut -'"-"-'r''' '"7*8™. 



gelaltnoso-incrassata. ». visibiU, 3-7 /< crassa. cavitate plusmophora 40-50 xx2-,8, «? J^J-'- • 



1 asco subbisertatae, simplices. mcohres, ellipsoideae .el late ell.pso.deae, mcnbrana -'«" -*;';)• 



(,3-) 14.0-5.5x8-0,. Pyaddia sparsa, extus baud vel vi. v,s.b,l.a. omn.,a> ••nmer» osttolohaud 



carbonaeeo; pycnoeomdia bacillaria, recta. r^:<circ. 1-5 /<. Thallus ext,u .ntusque ^HO- CaClA-, 



C,H.(NH,V Is gelatitm hymenealis I+sublilissime rosea vel-, parietibus ascorum .mmulatis, spom 



^"Thluult'secion has a slightly developed light brown cortical layer up to to, th.ck^formed from 

 the end cells of the vertically fused thallme hyphae; cells thm-wa led, 3-4/; ^"'";- , ';™ f ' f « J 

 in well-marked vertical rows, larger and more crowded in upper (k^90/' «* thallus, often shghtly 

 horlontally flattened, multiplying apparently by bmary fission. Medullary «ssue M.ne, P- 

 plectenchymatic, of ± cubical thin-walled cells 3-5/- diam. No dark hypothallme ttssue presen 

 Exctulum formed of tangentially running compacted hyphae about 2, th.ck. Per.physes well 

 devTped on upper inner L of excipulum round the ostiole; embedded in hyf'™ -"'^S^^^^f ' 

 or soarinriv branched 30-45 x 1.5-2.5;,. Asci spring from both base and sides of excpulum, the 

 t ::: otherswoll^n'and'high'y geUtinized walls can be distingu.shed only ^'-r treatment wr^ 

 iodine, which tints the surrounding mucilage ±rose pink. The spores often contain a single moderate 

 guttuk. Pycnidia irregularly flask-shaped, about 60;, across, 150, deep. Perifulcrmm colourless. 

 Fulcra exobasidial, simple, subulate, 12-20 x i-^-z-oii. 



