Plants often densely cespitose, densely and softly pubescent
throughout, with soft, thin, spreading, papillose-based hairs on the culms and
lower sheaths. Culms usually over 30 cm. Midculm sheaths about
1/2 as long as the internodes; blades at midculm generally 6.5-12 cm long,
usually more than 7 times as long as wide, suberect, softly pubescent on the
abaxial surface, without papillose-based cilia on the distal 1/2. Primary
panicles usually poorly exserted, peduncles shorter than 6 cm. Spikelets
mostly 1.8-2 mm.
Dichanthelium acuminatum subsp. thermale grows on the mineralized
crust of warm, moist soil at the Geysers, Sonoma County, California; it is listed
as endangered in that state.