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482 119.Acolium. 4..CEN0THALAMEiE. PLcell.aph.
XXIX. 119. ACOLIUM. Acharius. Acolium.
Tliailus crustlike, flat, expanded, pdnate, uniform ; apoihecia
cuplike, nearly sessile, cartilaginous, composed of a
compact powdery mass forming a naked centre, the upper
part flat or nearly globular.
1. Acolium tigillare. Rafter acolium.
Crust in beds, wartlike, rather bald, lemon-yellow ;
apo-
thecia sessile, deep black, opake, centi-e flat, border swollen.
Lichen tigiUaris, Achat: Prod. 67 ;
"Lecideii tigillaris, Achar. Meth. 46 ;
On old timber-work.
Engl. Bot. 1530.
Lich. 164.
2. ylcoUum tympanellum. Little-drum acolium,
Crust cartilaginous, smooth, afterwards rather warty,
uneven, gray ; apothecia sessile, black, centre flat, with a
o-reyish hoar; border thin, even with the centre.
Liclien inqtiinans, Engl. Bot. 810.
Calicium tympanellum, Achar. Meth. 89 ;
Lich. 233.
On timber-work.
When touched stains the fingers black.
3. JcoUum stigonellum.
Dimpled acolium.
Crust scarcely cracked, uneven, whitish, or 0; apothecia
sessile, nearly globular, black, bald ; centre dotlike, afterwards
flattish, opake; border thin, naked.
Liclien gelasinatus, Withering Bot.Arr. 4.
Lecidea gelasinata, Achar. Meth. 33.
Sphaerocarpus sessilis, Ehrh. Crypt. 320.
Spha^ria spliinclerica, Sowerby BrU. Fungi, 386, 1.
Calicium sessile, Fersoon Tent, Fung. Suppl. 59.
Calicium stigonellum, Achar. Meth. 88; Lich, 232.
On the bark of oak-trees, and on the crust of porina per-
tusa.
XXX. 120. PHACOTRUM. Acharius. Phacotrum.
Tkallus crustlike, flat, expanded, adnate, uniform ; apothecia
podicilled, centre powdery, flat or globular, border
prominent.—The centre of the apothecia sometimes falling
out, they are left hollow.
1. Phacotrum microcephalum. Small-headed phacotrum.
Crust rather tartarlike, not broken, wrinkled, olivecolour
; apothecia nearly globular, black, shining ; centre
depressed, opake ; podicils short, similar in colour.
Lichen microcephalus, Engl. Bot. 1865.
Calicium microcephalum, Achar. Syn. Lich. 57,8.
On oak-wood.