Kretzschmaria pavimentosa (Ces.) P. Martin



Kretzschmaria pavimentosa (Ces.) P. Martin, J. S. African Bot. 42: 74. 1976.

º Hypoxylon pavimentosum Ces., Atti Accad. Sci. Fis. 8: 18. 1879.

º Ustulina pavimentosa (Ces.) Cooke, Grevillea 12: 3. 1883.

= ? Ustulina brasiliensis Speg., Anal. Soc. Cient. Argent. 12: 110. 1881.

= Kretzschmaria bulgarioides Rehm, Hedwigia 40: 143. 1901.

Stromata discoid, restricted-pulvinate, or effused pulvinate, discrete or densely aggregated, 0.3-7 cm diam x 1-4 mm thick, attached to substrate with narrow connectives, usually with crenate, thick, steep margins; surface copper brown, dark brown to blackish brown, smooth or with major cracks; carbonaceous immediately beneath surface; tissue between and beneath perithecia coriaceous to woody, white to gray, becoming dark brown and disintegrating.

Perithecia obovoid to tubular, 0.5-1.2 mm diam x 0.8-2 mm high.

Ostioles papillate.

Asci 290-370 mm total length x 11-15 mm broad, the spore-bearing parts 200-240 mm long, the stipes 80-150 mm long, with apical ring bluing in Melzer's iodine reagent, urn-shaped, 6-9 mm high x 4.5-6 mm broad.

Ascospores dark brown to blackish brown, unicellular, fusoid-inequilateral, with acute ends sometimes pinched, smooth, 35-54(-56) x 7.5-11 mm, sometimes laterally compressed, with narrow sides 6.5-8 mm and broad sides 11-14 mm, with straight germ slit much less than spore-length.