PL celL apk. 6. SARCOTHALAMEZE. 135. Actid. 509 
Actidium Esenbeckii. Esenbeck's actidium. 
Thecae roundish, flat ; mouth with five or six valves turned 
back. 
Hysterium valvatum, Esenbeck Syst. 1,281. 
On decayed wood. 
II. 136. HYPODERMA. De Candolle. Hypoderme . 
Thallus 0; thecae long, linear, bursting the epidermis; 
mouth a simple, linear slit. 
1. Hypoderma fraxini. Ash-tree hypoderme . 
Thecae opake, blackish, ovate oblong, convex; mouth 
deep, lips turned back. 
Sphmria sulcata, Bolton Fungi, 124; Sowerby Engl , Fungi y 315. 
Hysterium fraxini, Persoon Syn. Fung. 100. 
Hypoderma fraxini, De Cand. Syn. FI. Gall. 64. 
On the branches of ash and maple. 
2. Hypoderma quercinum. Oak hypoderme . 
Thecae greyish-black, oblong, large, rather bellied, bent; 
lips acute, crisped. 
Hysterium nigrum, Tode Fung. 1,5. 
Variolaria corrugata, Bulliard Champ. 117. 
Sphceria collapsa, Sowerby Engl. Fungi, 373. 
Hypoderma quercinum, De Cand. Syn. 64. 
On dead sticks. 
3. Hypoderma cojiigerum. Conebearing hypoderme . 
Thecae blackish, rather ovate, very small; inside wrinkly, 
powdery. 
Hysterium conigerum, Persoon Syn. 102. 
Hypoderma conigerum, De Cand. Syn. 824. 
On dried strobiles of fir-trees. 
4. Hypoderma crispum. Crisp hypoderme . 
Thecae long, convex, rather bellied ; Ups thin, crisp. 
Hysterium crispum, Persoon Syn. F. 101. 
Hypoderma crispum, De Cand. Syn. 826.* * 
On the bark of pine-trees. 
5. Hypoderma arundinaceum. Reed hypoderme , 
Thecae, oval, depressed, greyish black, granular. 
Hypoderma arundinaceum, De Cand. Syn. 825. 
On dead stems of arundo vallatoria. 
