Bd. IV: ı1) THE LICHENS. 3 
Lecidea interrupta nov. spec. 
(Plate ı, fig. 1.) 
Thallus tenuis, laevis, flavescens, indistincte areolato-rimulosus, continuus et hinc 
inde interruptus, K intense flavescens; hypothallus thallo concolor aut distincte nigri- 
cans, thallo lichenis alieni tactus semper nigricans; gonidia protococcoidea; apothecia 
nigra, lecideina, elevata, margine proprio distincto instructa, 0.5 ad 0.8 mm lata; epi- 
thecium et parathecium carbonaceum; hypothecium decolor; paraphyses ad I u latae; 
asci 40—50 u longi et 15—20 u lati; sporae octonae, polyseriatim dispositae, hyali- 
nae, unicellulares, I0—13.5 (rarius ad 20) x 5—6 u magnae; spermo&onia et soralia 
nulla visa; habitat ad saxa, Falkland Islands, Port Stanley. 
Notes: This species is well characterised by the regularly interrupted thallus. 
Here and there, possibly where the thallus is rather young, the substratum is quite 
exposed and the thallus interrupted. This happens most frequently in smaller plants. 
In many cases the margin of the thallus in these interrupted portions is fringed by 
a very fine dark line. The hypothallus is always clear when we have the real mar- 
gin of the whole lichen before us. It is then quite dark and it may extend a con- 
siderable distance. In contact with other lichens of the same or of another species 
a thick black margin is formed which of course is very usually the case. This thick 
black separating margin reminds one at first of the new Zecidea agellata. Rhizo- 
carpon geographicum is generally found growing on the same substratum. 
Lecidea capistrata nov. spec. 
(Plate ı, fig. 2.) 
Thallus crassiusculus, sordide albidus aut parcissime flavescens, substrato arenaceo 
quasi concolor, continuus et hinc inde distincte areolato-rimosus, K -—; apothecia im- 
mersa saepius aspicilioidea, lecideina, nigra, sed margine proprio albido instructa 
quasi capistrata, rotundata aut saepius difformia, 0.5 ad I.; mm lata; epithecium 
nigricans; parathecium et hypothecium decolor; sporae octonae, polyseriatim dis- 
positae, hyalinae, unicellulares, 10—15 x 6—8 u magnae; spermogonia et soralia non 
visa; habitat ad saxa arenacea, Falkland Islands, Port Louis. 
Notes: The immersion of the apothecia is a marked feature of this species. The 
young apothecia are surrounded by the white proper margin containing no gonidia. 
The appearance is thus at first that of a species of Aspieilia. Later on the apo- 
thecia rise up rather and coming into contact with neighbouring apothecia become 
rather misshapen and are no longer round in form. This species occurs on rocks 
along the shore. 
