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Bd. IV: ıı) THE LICHENS. I 
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Buellia melanotrichia nov. spec. 
(Plate 3, fig. 27.) 
Thallus tenuissimus, rimoso-areolatus, maculas formans minutas ad 5 mm latas; 
areolae pallide fuscescentes hypothallo superimpositae bene distincto aterrimo, ex 
hyphis formato capillaribus, nigris, tenuissimis, emanentibus; hypothallus totus I—ı.s 
mm latus; K —; apothecia nigra, margine proprio circumdata non semper bene di- 
stinceto, disco plano aut parce convexo, 0.3—0.; mm lata; epithecium, parathecium 
et hypothecium nigro-fuscum aut carbonaceum: sporae octonae, pallide fuscescentes, 
bicellulares, medio non constrictae, apicibus rotundatis, 28—32%x8—12 u magnae; 
spermogonia non visa; habitat ad lapillos, Soxtk Georgia, Cumberland Bay, Mo- 
raine Fiord. 
Notes: This is again a very clearly marked species owing to the small but not 
undeveloped thallus. The central portion consists of a few well marked areoles of a 
pale brownish colour which are considerably higher than the dark hypothallus which 
forms a very characteristic feature of this species. It is made up of fine thread-like 
but flattened filaments which spread from the thicker areolate portion of the thallus. 
The whole plant in any case is very small and it appears to be a rapid grower as 
it occurs on small stones. 
Buellia Nelsonii nov. spec. 
(Plate 3, fig. 28). 
Thallus flavescens, irregulariter rimoso-diffractus, crassiusculus, bene evolutus, 
maculas formans in paucis speciminibus visis ca. IO mm latas, hypothallo instructus 
nigerrimo ad 8 mm lato; K —; apothecia bene elevata, et semper nigerrima, margine 
proprio instructa semper distincto et disco plano dein convexo, difformia aut saepius 
confluentia, 0.4—0.7 mm lata; epithecium et parathecium carbonaceum; hypothecium 
valde fuscescens; sporae octonae, bicellulares, fuscae, 183—20%x 8—9 ıı magnae; medio 
non constrictae, apicibus rotundatis; spermogonia non visa; habitat ad saxa, South 
Shetland Islands, Nelson Island. 
Notes: Here again the very marked hypothallus is an important and distin- 
guishing feature. The black hypothallus is not only developed near to other neigh- 
bouring lichens but it is best developed where it is not in contact with other plants 
where it is free to grow at its own will. In one or two cases 4-celled spores were 
found, though 2-celled ones were by far the commoner. The former measured 
24—26x8—1IO u. 
Buellia latemarginata nov. spec. 
(Plate 3, fig. 29). 
Thallus sordide cinereo-fuscescens aut obscure fuscescens, crassiusculus, irregu- 
lariter profunde rimoso-diffractus et areolatus, aut quasi squamoso-tuberculatus; hypo- 
