395 
PL cell. aph. 3. HOMOTH ALAMEiE. 
A. Phallus gelatinous , when dry cartilaginous ; Colle- 
matidese. 
Phallus crustlike, slightly figured or 
uniform Placynthium. 80. 
Phallus pleated tile-wise, roundish ; 
lobes minute, thick, turgid Enchylium. 81. 
Phallus rather leaflike, irregular ; 
lobes thick, naked, turgid Scytenium. 82. 
Phallus leaflike ; 
lobes rounded, downy beneath ........ Mallotium. 83. 
Phallus leaflike ; lobes naked, 
rather membranaceous, blackish green Lathagrium. 84. 
Phallus leaflike; lobes naked, 
membranaceous, greyish Leptogium. 85. 
Phallus very finely torn and 
branched Polychidium. 86. 
B. Phallus with a fibrous axis , bark crustlike . Usneadese. 
Apothecia shieldlike, terminal, edgeless .... Usnea. 87. 
C. Phallus cartilaginous , inside tow-like. Ramalinidese. 
Apotliecia shieldlike, terminal, nearly 
marginless Cornicularia. 88. 
Apothecia saucerlike, edged, slightly 
pedicelled; thallus nearly solid Ramalina. 89. 
Apothecia saucerlike, edged, not 
pedicelled ; thallus rather pipey Alectoria. 90. 
A. CoLLEMATiDEis. Phallus entirely gelatinous, homo- 
geneous; when dry hard, cartilaginous, crustlike, leafiike, 
or branched ; apothecia shieldlike, sessile or slightly pedi- 
celled, sometimes when dry coloured in the centre. These 
ought to be moistened before they are examined, as many 
of them have their apothecia of a different colour when 
dry. 
I. 80. PLACYNTHIUM. Acharius. Placynthe . 
Phallus crustlike, slightly irregular or uniform. 
Placynthium nigrum. Black placynthe. 
Phallus crustlike, nearly orbicular, browm-black; mar- 
ginal lobes deeply crenate; central lobes seedlike, slightly 
branched ; apothecia at length convex, black, edged. 
