Hehe ... miricalase.
Many phalaris species are known to produce gramine in addition to N,N-DMT, 5-MeO-DMT, and 5-OH-DMT. It’s possible that the same N-methyltransferase enzyme does the dimethylation. Or if not, they almost certainly have a recent common ancestor. Here's some interesting stuff I dug up (see below). It seems tryptamine itself has been mentioned as an antifungal. That gives more weight to my theory. Okay, it's about time I get back to work!
N-Methyltransferase involved in gramine biosynthesis in barley: cloning and characterization. Larsson KA, Zetterlund I, Delp G, Jonsson LM. 1: Phytochemistry. 2006 Sep;67(18):2002-8. Epub 2006 Aug 22.
Plants defend themselves against microorganisms and
insects by constitutive and induced defenses, many of them
involving secondary metabolites. The indole alkaloid gramine
occurs in reed canarygrass (Phalaris arundinacea)
and in barley (Hordeum vulgare). In the former grass, consumption
of
gramine can adversely affect ruminant performance,
whereas in barley, gramine has received attention
mainly as
a proposed defense compound, especially against
aphids (Zu´n˜iga et al., 1985, 1988; Zu´n˜iga and Corcuera,
1986; Kanehisa et al., 1990). Moreover, it has been
reported that infestation by the
greenbug (Schizaphis graminum),
(Velozo et al., 1999), pruning, or inoculation with
the
powdery mildew fungi increased the gramine content in
barley leaves (Matsuo et al., 2001).
Gramine increase associated with rapid and transient systemic resistance in barley seedlings induced by mechanical and biological stresses. Matsuo H, Taniguchi K, Hiramoto T, Yamada T, Ichinose Y, Toyoda K, Takeda K, Shiraishi T. Plant Cell Physiol. 2001 Oct;42(10):1103-11.
Diverse antifungal compounds were reported to exist in barley, that
were characterized as hordatin (Stoessl 1967), p-coumaroylagmatine
(Stoessl 1965), p-coumaroylhydroxyagmatine (von Ropenack et al. 1998),
tryptamine (Miyagawa et al. 1994), thionins (Bohlmann et al. 1988),
gramine (Wippich and Wink 1985), pathogenesis-related proteins
such as chitinase and β-1,3-glucanase (Leah et al. 1991),
ribosome-inactivating protein (Reinbothe et al. 1994), and lipid transfer
proteins (Molina et al. 1993).