Pl. cell. aph. 5. IDIOTHALAMEZE. 134. Hysterina. 507 
Graphis microscopica, Ehrh. Crypt. 278. 
-Opegrapha microscopica, Engl. Bot. 1911. 
Cpegrapha epipasta caragane, Achar. Meth. 26; Lich. 258. 
On the smooth bark of trees, mostly in company with 
lejophlea analepta, gen. 128, 2. 
11. 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. 117, 3 
12. Hysterina denigrata. Smutted slit-moss. 
Crust regular, membranaceous, palish-white; apothecia 
sessile, cr owded, rather shining, longish, bent, sometimes 
branched; centre slightly channelled. 
Opegrapha atra, Persoon in Uster Ann. 7, 30. 
Opegrapha denigrata, Achar. Meth, 263; Lich. 259; Engl, Bot. 1753. 
Opegrapha denigrata melanochroa, Achar. Meth, 27. 
Opegrapha denigrata atra, Achar. Lich. 260. 
On the bark of wallnut, ash, oak, and beech trees. 
we 
Fam. VI. 6. SARCOTHALAMEZ. = Fungorum pars, 
Linneus. Hypoxylorum pars, De Candolle. 
Xylaria, Link.  Myelomyci, Esenbeck. 
Algarum pars, Jussieu. 
Thallus corky, fleshy, or 0; thece mostly immersed in 
the thallus or substance of the plant, coriaceous or bony, 
of a different substance from the thallus, opening by a re- 
gular mouth, sometimes but rarely bursting irregularly; 
sporidia ringed, intermixed with a deliquescent, deciduous 
pulp. —Grows generally on decayed plants, under the epi- 
dermis. 
ca Sporidia fixed ; thece opening by a slit; thallus 0. 
Hysteridez. 
Theca roundish, erumpent; 
month valvular ee... eee. te eet ges oe FRCTIDEUMS 41 35: 
~Theca long, erumpent; mouth linear HypopeRMa. 136. 
Theca long, naked ; mouth linear.... Hystrrium. 137. 
