510 136. Hypod. 6. SARCOTHALAMEiE. Plcell.aph. 
6. Hypoderma xylomoides . Xyloma hypoderme . 
Thecce elliptical, flat, shining, black. 
Xyloma hysteroides, Persoon Syn. 106. 
Hypoderma xylomoides, De Cand. Syn. 823. 
On dead hawthorn and laurel-leaves. 
III. 137. HYSTERIUM. Persoon. Hysterium . 
Thallus 0 ; thecce long, naked ; mouth a simple linear slit. 
—On old dead wood. 
1. Hysterium mytilinum. Mussel hysterium. 
Thecce aggregate, black-green, upright, lenticular, 
streaked crosswise, slightly pedicelled. 
Hysterium mytilinum, Persoon Syn. 97. 
On the bark of abies excelsa. 
2. Hysterium pulicare. Flea-hrown hysterium . 
Thecce gregarious, oblong, blunt, streaked, black ; lips 
blunt. 
Hysterium pulicare, Persoon Syn. 9S. 
Lichen scriptus #, Light f. Scot. 2, 801. 
On dead branches of oak-trees. 
3. Hysterium angustatum . Narrow-mouth hysterium . 
Thecce crowded, linear, parallel, black; lips sharp. 
Hysterium angustatum, Persoon Syn. 99. 
On decayed wood. 
B. SpHERTDEiE. Thallus fleshy, leatherlike, crustlike, 
or 0 ; thecce fixed, roundish, opening by a roundish mouth, 
sometimes remaining closed ; sporidia long, mostly club- 
shape, twisted, deliquescing into a liquid slime; sporce ob- 
long, ringed. 
IV. 138. XYLARIA. Hill. Xytaria. 
Thallus long, clubshape, fleshy ; thecce roundish, in the 
circumference of the thallus ; mouths circular. 
a. Growing on the earth. 
1 . Xylaria militaris. Soldierlike xylaria, 
Thallus yellowish red, head rough, rather tubercular ; 
mouth slightly prominent. 
