1922] LUPO—HYPOXYLON 489 
most frequent devices is that of specially adapted articulation 
surfaces near the cross-walls (fig. 2b), where the cell of another 
4 — 7 
Fics. 2-7 —Fig. 2, portion of hyphae from central region showing two i 
variations in size and me ethods of mechanical support; a, pit through wall; 6, articu- 
lation surface at septum; ¢, bulb T; X1250; 
figs. 3, 4, hyphae from same zone showing support gained by twisting and branch- 
ing; X1250; figs. 5, 6, interhyphal connections: a, ole from — 
protuberance; X1250; fig. 7, surface view of early sseulecel coil; X1250 
thread rests against a flat supporting surface for a brace. Another 
. method of support (figs. 2c, 3) is the interlocking of adjoining hyphae 
