OF FILAMENTOUS, FRUTICULOSE, AND FOLIACEOUS LICHENS. 129 
very irregular warts, paler than the thallus, generally flattened on their surface; 
having an ostiole concolorous with the thallus, or paler, never black. 
Specimen 3.—Kinnoull Hill, Perth; rocks on summit, overlooking the Tay, 
W.L.L. A small, rigid, dwarf, dark-coloured form, as in No. 2. Some speci- 
mens are quite free from spermogones, others have them in abundance, as 
in No. 2. 
Specimen 4.—Lricuton’s exs., No.2. Engl. Bot. 688; on rocks, South Stacks, 
Holyhead, Anglesea; sterile. Spermogones are abundant in both specimens in 
my copy ; large and small forms of thallus. They are generally confluent, and very 
irregular in form; occasionally having a blackish ostiole. The spermatia are 
about zuth long, and sterigmata about ath. Many of the latter are really ramose, 
giving off linear elongated branches or cells near their base. The hypertrophied 
anastomosing filaments are very abundant and distinct in the right-hand specimen 
in my copy. 
Specimen 5.—Forfarshire, T. Drummonp; in Hookerian Herb., Kew (sub nom. 
R. fraxinea var. fastigiata). Segments very much warted over with spermo- 
gones, having black ostioles. 
Specimen 6.—Miss Hurcuins; apparently from Ireland; in Hookerian Herb., 
Kew. Spermogones abundant, but pale and inconspicuous. The thallus here is 
terebrate, or pierced by foramina, and marked by lacunee. [ have noticed this 
condition in many other British specimens of this species, so that it can scarcely 
be regarded as a good specific character,—as in Taytor’s &. terebrata. In another 
specimen, also from Miss Hurcuins, in the same Herbarium, the ostioles of the 
spermogones are black-punctate. 
Specimen 7.—Rocks, Scilly Islands, pion in Hookerian Herb., Kew. Flat 
linear segments, showing a transition to &. calicaris. ‘These are dotted over with 
spermogones, which, from having black-punctate ostioles, are easily seen. 
Specimen 8.—Probably from the coast of Appin, Argyleshire, CARMICHAEL; in 
Hookerian Herb., Kew. Spermogones abundant, and with black ostioles. They 
are pale and inconspicuous in other specimens marked from the Hebrides. 
Specimen 9.—Lundie Crags, about ten miles from the sea (near Dundee), 
GaRDINER, 1844; in Hookerian Herb., Kew. The thallus is of a very dark green, 
almost black; the spermogones pale. 
Specimen 10.—GREVE DE Leca., Jersey, 1851; in Hookerian Herb., Kew. The 
thallus is of a pale lemon-yellow, probably the result of age and desiccation. The 
tips and bases of the segments of the thallus are black, while the thallus is studded 
over with patches of black. The spermogones are abundant, with largish black 
ostioles, occasionally resembling somewhat the spermogones of Newropogon melax- 
anthus. 
Specimen 11.—Teneriffe, rocks near the Mesa de Mota, 1849; Bourcrav PI. 
Caner., No. 351. Spermogones abundant, and with black osticles. 
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