Latin name: Mitthyridium jungquilianum (Mitt.)
Syrrhopodon jungquilianus Mitt.
Plants small-medium and usually pale green or
yellow-green in color. Branches up to 2 cm long, but are often less. Leaves to
3 mm long, and only about 0.6 mm wide at its widest point; no appreciable shoulders
are present. The lamina is linear-lanceolate with an acute apex. Stereome (border
of hyaline cells) present only at the very base of the leaf around the cancellinae.
The cancellinae are composed of between 15 and 19 cell columns, more than its
close relative and sister lineage, M. subluteum. ). Cancellinae are very short
typically occupying 1/5-/17 the total leaf length. Costa ending just below the
apex. Laminal cells small (5-7 mm wide). Papillae are small and few or not present
at all. Sporophytes rare.
The lineages that compose this clade, m384, m398,
m364, m365, and m218 are the most distinctively "jungquilianum." The
lineages that are its close relatives have a suite of morphological characters
that grade into what feaures distinguish subluteum. It is likely that the confusion
surounding identification of subluteum and jungquilianum will continue.
[move the cursor over the image to view the morphological matrix]
that differentiate this lineage from its closest relatives, subluteum, luteum
and perundulatum are few. Still its distinctness as a unique monophyletic group
is sufficient to warrant a name. The % cancellinae in jungquilianum is smaller
than its relatives, often 1/6 rather than 1/5 (found in subluteum) and the amount
of the leaf occupied by the distinct stereome is typically less, 1/7 rather than
1/6th of the total leaf length.
General phylogenetic characteristics
of the "luteum complex":
All of the groups in this linear leaf
"luteum complex" (subluteum, jungquilianum, luteum, and perundulatum)
except perundulatum have small cancellinae that occupy no more than 1/5-1/7
the total leaf length. All have state 1 for the shape of the transition from cancellinae
to lamina. All except luteum have extensive serrations along the leaf margin.
All have very few border cell columns (approximately 7 or less). All except perundulatum
have a border that does not widen into the stereome characteristic of Mitthyridium
until the very base of the leaf (state 5 or 6). All except perundulatum
have an acute leaf apex.