Kretzschmaria pavimentosa (Ces.) P. Martin

TELEOMORPH | CULTURES AND ANAMORPH | SPECIMENS EXAMINED | NOTES

NOTES

This fungus is one of the most frequently encountered Kretzschmaria species in the tropics and subtropics. Stromata of K. pavimentosa usually have thick, steep margins. Kretzschmaria sandvicensis has a similar ascospore size range but differs in having sloped margins, in having ascospores with a nearly spore-length germ slit and obtuse ends. Also compare with K. eriodendri. It is noteworthy that the ascospore size range from the type of Hypoxylon pavimentosum is 44-54 x 10-11 mm, close to the upper limit of the species, whereas that from the type of K. bulgarioides is 36-42 x 7.5-9 mm, close to the lower limit of the species. However, other specimens that we have examined have ascospore size ranges bridging the gap and forming a continuum over a wide range.

We were unable to locate Cesati's original material at RO. We thus lectotypify the part of type material at K. The illustrations of Hypoxylon pavimentosum provided by Miller (1961) are based on a T. D. Maitland collection from Uganda which has coarsely papillate ostiolar openings. We consider this fungus a distinct species and describe it as new herein (see K. milleri). We have not examined the type of K. brasiliensis. The description of Spegazzini (1881) seems to correspond with our concept of K. pavimentosa.

Three specimens [BRAZIL: Par? Municipio Oriximin? Rio Trombetas, 14 km N on Cachoeira Porteira Rd., 19.VI.1980, Dunn, P., 80PHD-16, wood (JDR; NY). GUYANA: Cuyuni-Mazaruni Region, Mazaruni Subregion, along Koatse R., 3.III.1987, Samuels, G. J. et al. 4927, wood (JDR; NY). FRENCH GUIANA: Upper Marouini R, between Roche Koutou and an unnamed granitic 350 m high inselberg, elev. 200-300 m, 19-20.VIII.1987, Samuels, G. J. et al. 5920, bark (JDR; NY).] are similar to K. pavimentosa but differ in having a reticulate network of cracks on the stromatal surface and in having a nearly spore-length ascospore germ slit. They might represent a new taxon. San Martín and Rogers (1993) documented Kretzschmaria cf. bulgarioides from Mexico. The general morphology of that fungus agrees with K. pavimentosa except for having smaller ascospores and stipitate stromata. It likewise might represent a new taxon.