Tuesday, August 14, 2018

[Botany • 2018] Cryptocoryne joshanii (Araceae) • A New Species Serendipitously Discovered in Sulu archipelago, Philippines

 Cryptocoryne joshanii Naive & Villanueva 

in Naive & Villanueva, 2018. 
Photos by: M.A.K. Naive. 

 A new species, Cryptocoryne joshanii Naive & Villanueva, from the island of Basilan, Philippines, is herein described and illustrated. It is comparable to C. usteriana, but differs significantly in having lanceolate leaves, acicular, outwardly recurved, purplish red stigmas and an erect spathe limb. Information on the geographical distribution, ecological data, phenology and conservation status as well as an identification key to the Philippine Crytocoryne species are provided.

 KEY WORDS: Aroids, Basilan, Cryptocoryne, Mindanao, New species, Sulu archipelago, Philippines. 

Fig. 1. Cryptocoryne joshanii Naive & Villanueva 
A. Habit B. Spathe C. Leaf D. Cataphyll E. Kettle F. Tube, limb G. Spadix showing the male and female flowers. 

Photos by: M.A.K. Naive. 
Scale bar: C, D = 5 cm; E, F = 2 cm; G = 1 cm.

Cryptocoryne joshanii Naive & Villanueva, sp. nov. 

 Type: PHILIPPINES, Mindanao Region, Sulu Archipelago, Basilan Island, elev. 850 m, May 2013. R.J. Villanueva 001/2017 (holo HNUL, iso USTH) - Full locality data withheld owing to the risk of potential exploitation of wild populations for commercial purposes. 

Diagnosis: Somewhat similar to C. usteriana in the spathe, but it differs significantly in having an acicular, outwardly recurved, purplish red stigmas and an erect smooth limb. The leaves are clearly different by being smooth, light green with markings. 

Distribution: This Philippine endemic species has only been observed and documented in Sulu archipelago, particularly on the island of Basilan, Philippines. It is very local and despite of extensive survey along the stream and in other areas, it occurs only on the site where the sample was collected. 

Ecology: The population of this species was found growing in a slow flowing montane forest stream in the interior of Basilan Island. The forest is relatively dense with only 40% sunlight reaching the stream bed. The population grows on volcanic rock in the stream several meters from the waterfall at elevations of about 800– 1000 m a.s.l. The roots and rhizomes were noted to penetrate deep into the pebble/sandy substrate rich with decaying leaves. The entire clump was submerged or partly submerged with leaves exposed. 

Eponomy: Named after Joshan Vlad A. Villanueva, son of the discoverer/second author.  

Notes: Based on overall morphology, Cryptocoryne usteriana, appears to be the closest ally of C. joshanii. However, C. joshanii differs significantly in having these following characters: lanceolate leaves, an erect apex of the limb and in having acicular, outwardly recurved, purplish red stigmas.

Mark Arcebal K. Naive and Reagan Joseph T. Villanueva. 2018.  Cryptocoryne joshanii (Araceae), A New Species Serendipitously Discovered in Sulu archipelago, Philippines. Taiwania. 63(3); 248-250.  DOI: 10.6165/tai.2018.63.248 

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