Alsophila javanica
Alsophila javanica, synonym Cyathea javanica, is a species of tree fern native to western Java and Sumatra, in Indonesia. It grows in rain forest and on riverbanks at an altitude of 250–1500 m. Description. The trunk of "Alsophila javanica" is erect and up to about 10 m tall. Fronds may be bi- or tripinnate and 2–3 m in length. The stipe is spiny and bears scattered scales throughout. These scales are dark and have fragile edges. "A. javanica" has round sori which are borne near the midvein of fertile pinnules. They are protected by firm, flat indusia that  are saucer-like in appearance. Taxonomy. "Alsophila javanica" appears to be most closely related to "Alsophila doctersii". Large and Braggins (2004) note that "A. doctersii" may in fact be of hybrid origin between "A. javanica" and a member of the "Alsophila latebrosa" complex. When Carl Blume described "A. javanica" (as "Cyathea javanica"), he also named one variety, "rigida". Large and Braggins (2004) note that although variety "rigida" is apparently part of the "A. javanica" complex, the name has also occasionally been associated with "Alsophila polycarpa".