5 S3 
VII. L1CHENES. 
[Opegrapha. 
Northern Islaud : Auckland, on bark, Knight.- — Resembles 0. varia, but the thallus is 
even and whiter, the apotheeia usually entirely closed by the more prominent border. 
Dr. Lindsay, in his ‘ Catalogue of Otago Lichens,’ adds three new species of Nylander, — 
0. agelceoides , spodopolia, and subeffigurans. 
36. PLAT Y GRAPHIS, Nyland. 
Tliallus thin or obsolete. Apotheeia black, flat, simple, no proper border, 
but sometimes a thin thallodal border. Spores colourless, fusiform, septate. 
Spermatia shortly cylindric, straight or slightly curved. 
A considerable tropical and temperate genus of corticolous Lichens. 
1. P. microsticta, Kn'ujht and Mitt, in Linn. Trans, xxiii. 103. t. 12. 
f. 23. Thallus dusky-grey. Apotheeia round or oblong, flexuose, simple or 
branched, broader at one end ; ends rounded. Apotheeia dark brown ; hv- 
pothecium black; spores fastigiate, fusiform, 3-septate, 0 00010 in. broad, 
0'00140 long. 
Northern Island : Auckland, Knight , on bark. — Thallus covered everywhere at equal 
distances by the apotheeia, which resemble specks to the naked eye. 
2. P. inconspicua, Knight and Mitt. l.c. t. 24. Thallus brown, with 
a lilac tinge when dry. Apotheeia immersed, very minute, roundish or ob- 
long, one end acuminate, blackish brown; spores fastigiate, ? not septate, 
fusiform, 0 00120 broad, 0 00175 in. long. 
Northern Island : Auckland, on bark, Knight. Remarkable for its lilac colour. Apo- 
thecia invisible till magnified, then like black dots. 
3. P. tumidula, Knight and Mitt. l.c. f. 25. Thallus dark yellow- 
brown. Apotheeia flat, surrounded by the somewhat swollen thallus, elongate 
or short-curved, defined by a narrow dark line ; hypothecium brownish -black ; 
spores fastigiate, without septa, fusiform, O'OOOl in. broad. O' 001 4 long. 
Northern Island : Auckland, Knight , on bark. — Thallus colour of Lecidia parasema. 
Apotheeia conspicuous, variable in form and size. 
4. P. occulta, Knight and Mitt. l.c. 104. t. 12./. 26. Thallus reddish- 
brown, obscure. Apotheeia irregularly branched, subradiate, angular ; edges 
torn ; thallodal border raised, powdery, white ; epithecium blackish-brown, 
flat ; hypothecium black; spores fastigiate, fusiform, 4-?-septate, 0'00005 in. 
broad, O' 00 160 long. 
Northern Island : Auckland, on bark, Knight . — Apotheeia invisible till magnified. 
Dr. Lindsay enumerates P. lovgifera, Nyland. n. sp. 
37. PL AGIO GRAPHIS, Knight and Mitten. 
Thallus very thin, obscure. Apotheeia elongate, like cracks, surrounded by 
a perithecium, which is covered by the thallus, connivent above, divaricated 
and oblique below ; hypothecium free. Asci pyriform ; spores 2-locular. 
A genus only known from New Zealand. 
1. P. devia, Knight and Mitt, in Linn. Trans, xxiii. 104. t. 12. /. 27. 
Thallus smooth, yellow or grey. Apotheeia blackish-brown, elongate. 
