Pl. cell. aph. 7. PROTOMYCEZE, 161. Stilbospora. 545 
XI. 161. STILBOSPORA. Persoon. Stillospore. 
Sporidia dark-coloured, ringed, in irregular heaps. 
1. Stilbospora asterosperma. Star-seeded stilbospore. 
Sporidia starlike, 3 or 4-rayed. 
Stilbospora asterosperma, Persoon Syn. 96. 
_ On the branches of beech, birch, and maple-trees. 
2. Stilbospora spherosperma.  Round-seeded stilbospore. 
Sporidia globular, minute. 
Stilbospora spherosperma, Persoon Syn. 91. 
On the dry stems of the common bankside reed. 
C. XytomipEm. Sporidia budlike, enclosed in a crust ; 
crust swollen, variable in shape; inside pale; texture ir- 
regular, cellulat, under the epidermis of plants. 
XII. 162. XYLOMA. Persoon. Ayloma. 
Crust hard, inside fleshy, cellular. 
1. Xyloma salicinum. Willow xyloma. 
Crust black, shining, thick; inside granular, white. 
Xyloma salicinum, Persoon Syn. 103. 
On willow-leaves. 
Solitary, bossed. 
B. confluens. Crust confluent, disk naked. 
2. Xyloma acerinum. Maple xyloma. 
Crust black, flat, surface rather unequal with winding 
lines. 
Xyloma acerinum, Esenbeck Syst. 2, 5. 
Xyloma punctatum, Persoon Syn. 104. ~ 
On the leaves of maple and sycamore-trees. 
Aggregate, orbicular. 
B. confluens. Crusts confluent. 
Xyloma acerinum, Persoon Syn. 104. 
3. Xyloma leucocreas. White-flesh xyloma. 
Crust thick, tubercular; inside white. 
Xyloma leucocreas, De Cand. Syn. 63. 
On the leaves of different species of willow. 
VOL. I. 2N 
