|
 Poculum sp. "hinau"
BiostatusPresent in region - Indigenous. Endemic
Description: Excipulum about 30 µm thick, of cylindric cells 5-7 µm diam., with walls thick, gelatinous.
Outer layer of hyphae 4-5 µm diam., thickly encrusted with bright yellow-brown material,
end cells of encrusting elements undifferentiated.
Paraphyses 1.5 µm diam., swelling to 3-4 µm at clavate to fusoid apex, extending 10-20 µm
beyond asci. Asci 100-120 x 10.5-12 µm, cylindric, apex rounded, thickened, J+, 8-spored,
spores overlapping 1-seriate, extending more or less to base. Ascospores 22-25 x 4.5-6 µm,
oblong-elliptic, in side view flattened on one side, slightly wider towards the upper end, ends
more or less acute, slightly hooked at the apex, surrounded by gelatinous sheath about 3 µm
thick.
Notes: Poculum sp. on Elaeocarpus dentatus.
Associated with a small patch of stromatic tissue at the base of the stipe and with narrow,
black zone lines across the leaf. Characterised by its large, long-stipitate apothecia,
hymenium bright mustard-yellow, receptacle orange-brown. Ascospores distinctively shaped
and surrounded by a gelatinous sheath.
There are several discomycetes on fallen leaves of Elaeocarpus. Helotium elaeocarpi and
Hymenoscyphus leucopus (this second species found on a range of hosts) have small, sessile
to short-stipitate, concolorous, pale orange apothecia with a simple excipular structure.
Neither is associated with stromatic tissue. The two species are distnguished by ascospore
size. Lanzia ovispora Spooner is similar in size to H. elaeocarpi and H. leucopus, but the
outside of the receptacle is ornamented with a fine radiating pattern of slightly darker hyphae.
These hyphae are encrusted, release a yellow pigment into KOH and the ends are more or less
free. Poculum subcinnabarinum, found on a range of hosts, and rarely on Elaeocarpus, lacks
the well-developed network of encrusted hyphae on the outside of the receptacle, has a highly
gelatinous excipulum somewhat similar to Crocicreas, and has smaller ascospores.
|