Kretzschmaria Fr. was recently reinstated by Rogers and Ju (1998) to
accommodate xylariaceous fungi closely related to Nemania S. F. Gray and
effused forms of Xylaria Hill ex Schrank with regard to developmental
morphology and anamorphic characters. Rogers and Ju (1998) listed in detail
the distinctive characters of Kretzschmaria and we refer the reader to their
work for a comprehensive definition of this genus.
Kretzschmaria is mostly represented in tropical regions, 16 taxa are accepted
by Rogers and Ju (1998), of which only one is distributed in temperate
regions, K. deusta (Hoffm.: Fr.) P. Martin. Kretzschmaria deusta has formerly
been placed in various genera, among which Ustulina Tul.& C. Tul. has long
been retained by most of authors, until Miller (1961) placed it within his
broad concept of Hypoxylon Bull. Ju and Rogers (1996) excluded it from their
narrower concept of Hypoxylon and placed it in Kretzschmaria (Rogers and Ju,
1998), relying on the following features that they do not consider referable
to Hypoxylon:
-stromata strongly carbonaceous, usually more than 2 mm thick and loosely
attached to the substrate, with white tissue between perithecia that
progressively darkens and disappears, without KOH-extractable pigments;
-ascal apical apparatus higher than broad and ascospores with a germ slit on
the less convex side and with indehiscent perispore;
- anamorph in nature referable to Geniculosporium Chesters and Greenalgh,
palisadic, white to dark grey, covering the surface of young stromata.
Rogers and Ju (1998) separated two groups in Kretzschmaria, basing upon
stromatal morphology: ustulinoid taxa with massive effused-pulvinate stromata
that are loosely attached to the substrate ( K. deusta belongs to this
group), and kretzschmarioid taxa that are stipitate, gregarious, with the
fertile part less than 1 cm. diam, and stipes and/or fertile parts often
fused together.This latter group is only represented by tropical or
subtropical taxa.
----- Original Message -----
From: Jerry Ross
To: UK Tree Care
Sent: Thursday, January 13, 2005 8:08 AM
Subject: Whatever happened to Ustulina?
Just when did Ustulina become Kretzschmaria and why did no-one tell me?
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