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P/.a//.op//. 5.ID10THALAMEiE. 134.Hysterina. 507
Graphis rnicroscopica, Ehrh. Crypt. 278.
Opegrapha microscopica, Engl. Bot. 1911.
Opegrapha epipasta caraganae, Achar. Mtth, 26; Lich. 258.
On the smooth bark of trees, mostly in company with
lejophlea analepta, gen. 128, 2.
1 1 . Hysterina venosa. Veiny slit-moss.
Crust powdery, white; apothecia close together, branch-
ed, stuffed, prominent, bald.
Opegrapha venosa, Persoon in Act. Wetter. 2, 44 ; Achar. Syn. 334.
On the trunks of beech-trees ; always surrounded with
arthonia obscura, gen. 11 7, 3.
12. Hysterina denigrata. Smutted slit-moss.
Crust regular, membranaceous, palish-white; apothecia
sessile, crowded, rather shining, longish, bent, sometimes
branched; ce/z/re slightly channelled.
Opegrapha atra, Persoon in Uster Ann. 7, 30.
Opegrapha denigrata, Achar. Meth. 26; Lich. 259; Engl. Bot. 1753.
Opegraplia denigrata melanochroa, Achar. Meth, 27.
Opegrapha denigrata atra, Achar. Lich. 260.
On the bark of wallnut, ash, oak, and beech trees.
Fam. VI. 6. SARCOTHALAME^. Fungorum pars,
Linnaeus. Hypoxylorum pars, De Candolle.
Xylaria, Link. Myelomyci, Esenbeck.
Algarum pars, Jussieu.
Thallus corky, fleshy, or ; thecce mostly immersed in
the thallus or substance of the plant, coriaceous or bony,
of a different substance from the thallus, opening by a regular
mouth, sometimes but rarely bursting irregularly;
sporidia ringed, intermixed with a deliquescent, deciduous
pulp.—Grows generally on decayed plants, under the epidermis.
A. SporidiaJixed; thecce opening hy a slit ; thallus 0.
Hysteridese.
Theca roundish, erumpent;
mouth valvular Actidium. 1 35.
Theca long, erumpent ; woz^^A linear Hypoderma. Ifi6.
Theca long, naked; mouth linear .... Hystekium. 137.