558 vii. lichenes. [Leptogium. 
A genus with the habit, etc., of Collema , which it closely resembles. The species are 
very difficult of discrimination. 
1. L. Scoticum, Fries ; — Bab. in FI. N. Z. ii. 308. Thallus membra- 
nous, brown, laciniately lobed, plaited ; lobes rounded. Apotbecia small, 
rather concave, same colour as the thallus ; spores ovoid. — Nylaud. Synops. 
Lich. 123. 
Northern Island, Colenso. (Europe, N. Africa.) 
2. Xj. tremelloid.es. Fries ; — Bab. in FI. N. Z. ii. 308. Thallus lead- 
coloured or somewhat olivaceous, glaucous, membranous, lobed ; lobes some- 
times imbricate or crisped. Apothecia red, usually elevate ; spores ovoid or 
ellipsoid, 3 -septate, narrowed at both ends. — Nyland. Synops. Lich. 124. 
Common throughout the Northern and Middle Islands. (Cosmopolite.) 
3. It. Saturninum^ Nyland. — Collema, Bab. in PL N. Z. ii. 309. 
Thallus large, leaden-brown or greenish, lobed, or polvphyllous and compli- 
cate ; lobes sinuate, often furfuraceous, cinereous, pubescent below. Apo- 
thecia dirty brown, flat, almost shining ; border entire, cupulate ; spores 
ellipsoid, 3-septate. — Nyland. Synops. Lich. 127. 
Northern Island, Colenso. (Europe.) — Babington identifies this with an Antarctic, 
S. African, American, and Indian species, no doubt including L. Menziesii, Montagne, and 
L. Hildenbrandii, Nyl., under it ; but Nylander separates these latter, by (confessedly) very 
slight characters. 
4. Xj. chloromelum, Nyland . — L. Brebissonii ? Bab. in PI. N. Z. ii. 
307. Thallus lead-coloured and somewhat greenish, membranous, lobed, 
plaited longitudinally, very rugose ; lobes waved. Apothecia red or red- 
browu, plane or concave ; border thick, rugose and plaited, or granulate ; 
spores 3-5-septate, ellipsoid or narrowed at both ends. — Nyland. Synops. 
Lich. 128. C. rugatum, Tayl. 
Northern Island : Bay of Islands, on trees, J. I). H., etc. ' (Europe, America, India.) 
5. Xj. bullatum, Nyland. Thallus lead-coloured, opaque, closely rugu- 
lose, membranous, lobed and incised, wrinkles narrow acute undulate. 
Apothecia dull red, flat or tumid ; border thick, rugulose, bullate, often 
urceolate ; spores ellipsoid, 5-septate, narrowed at both ends. — Nyland. 
Synops. Lich. 129. 
New Zealand, {Nylander). (Tropical Asia and America.) 
4. CALICITJM, Acharius. 
Thallus granular, powdery or evanescent, very rarely scaly or obsolete. 
Apothecia black, stipitate, rarely subsessile, in turbinate capitula, globose. 
Spores brown or blackish, simple or septate. 
Minute, often microscopic Lichens, found on rocks and old wood. 
1. C. curtium, Borrer ; — Bab. in FI. N. Z. ii. 304. Thallus granular, 
cinereous or obsolete. Apothecia black; stipes often stout ; capitulum cylin- 
dric-turbinate ; margin white ; mass of spores black ; spores ellipsoid, black, 
1-septate. — Nyland. Synops. Lich. 156. 
Northern Island : on dead wood, Colenso. (Europe, N. America, N. Asia.) — A very 
minute plant, belonging to a genus of which the species are most difficult of discrimination. 
