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94 FIELDIANA: BOTANY, VOLUME 28
Type in herb. Chi. Nat. Hist. Mus., collected on rich forested
slopes along Rio Onia, near Bolero, north of Mesa Bolivar, state of
Merida, alt. 545-915 m., May 23, 1944, Julian A. Steyermark 56727.
Apparently a member of sect. Semaeophy Ilium Schott, this species
is related to A. Holtonianum Schott, A, Burchellianum (Engl.) Macbr.,
and A clavigerum Poepp. & Endl. in its deeply lobed, laciniate
leaves, but differs from all of them in the acuminate lobes of the
segments, each segment deeply cut in the manner of Monstera dilacerata.
The lobing most closely approaches that of /4. clavigerum,
but that species has most of the lobes rounded at the apex, and the
spaces between the lobes are larger. To add to the resemblance
between this species and Monstera dilacerata, it will be noted that
some of the leaflets of the segments have large holes, which appear
as natural as those in the Monstera, although in the single specimen
at hand, it is not possible to state definitely whether some of the
holes may not have been caused by insect damage. None of the
other lobate-laciniate species of Anthurium have long acuminate, upwardly
curved tips to the lobes of the segments, nor have as deeply
cut lobes as has this species.
Anthurium ptarianum Steyermark, sp. nov.
Planta terrestris, caudice erecto elongate, 1.5 cm. alto, circ. 1 cm.
crasso; cataphyllis lanceolatis, elongatis; foliorum petiole 53-60 cm.
longo, 4-6 mm. crasso; lamina coriacea erecta late ovato-hastata,
25-30 cm. longa, 15-16 cm. lata, apice obtusis, basi late subcordata,
lobis posticis brevibus vel semi-orb icularibus, 8-8.5 cm. longis,
8-8.5 cm. lads, exitu rotundatis, sinu amplo semicircular], lobo
antico inferne 15-16 cm., superne 7-8 cm. lato, nervis primariis e
basi nascentibus utrinque 4, interlobaribus et proximis liberis, nervis
secundariis confertis; spatha subcoriacea reflexa, lanceolata, apice
acuminata, basi decurrenti, 6.5 cm. longa, infeme 1.5 cm. lata;
spadice 9-15 cm. longo, 4-15 mm. crasso, tenuiter fusiformi, stipite
suffulto; tepalis in anthesi 1.8-3.5 mm. longis, 1.8-2.5 mm. latis;
ovario 1.5-2 mm. longo.
Lamina of leaf rich deep green above, paler below; spathe dull
green; spadix dull lavender; fruiting parts blood red (Fig. 12).
Type in herb. Chi. Nat. Hist. Mus., collected on forested southfacing
slopes overlying sandstone, on "Cave Rock" above "Cave
Camp", Ptari-tepui, state of Bolivar, alt. 1810 m., October 29, 1944,
Julian A. Steyermark 59509 (2 sheets).
Apparently a member of section Belolonchium Schott, it is nearest
A. conjunctum K. Krause of Bolivia and A. Lechlerianum Schott of
Peru in leaf shape. The spathe and spadix, however, are longer than
in those species.
It is characterized by the lavender spadix, dull
green elongated spathe, blades with 5 main nerves on each side and
closely secondary nerves.