Dendrobium bullenianum
This medium sized, hot to warm growing, epiphytic species is found in the Philippines in evergreen lowland forests at elevations up to 1000 meters with slender, slightly fractiflex, attenuate below, many noded, sulcate stems covered with sheaths and carrying submembraneous, ovate-oblong, obtuse leaves that are unequally bilobed apically and have clusters of orange flowers with red lines that arise on short to 2 1/2" [6.25 cm], densely flowered, almost globose inflorescence from all along the older dry canes.
It likes some direct sun in the morning and I treat it the same year round. It is normal for leaves to yellow up and fall off in the late summer just before it blooms.