Table 1. Major characters delineating Actinostachys minuta from A. wagneri, A. spirophylla and A. plana CharacterA. wagneri (Holttum 1955; Reed 1947)A. spirophylla (Holttum 1955; Reed 1947)A. plana (Reed 1947)A. minutaHabitatEpiphytic on stumps and bases of treesEpiphytic in moss-cushions on treesEpiphytic on tree fernsStrictly epiphytic on trunks of the tree fern Sphaeropteris polypodaStipeIndistinctIndistinctDistinct (5.5-7.5 long mm) flatDistinct (5-8 mm long) triangular in transectionLamina (sterile portion) length (cm)6-204-85.5-10.22.5-3.7Lamina (sterile portion) width (mm)0.5-0.7Ca. 1.51.4-1.740.8-1.0Number of stomatal rows on each side of costa11Not described1Sorophore length (mm)7-154-82.5-4.84-6Sorophore number2 to 51 to 33 to 6 but usually 41 to 4 but usually 1Sorophore lamina apexNot bifid, glabrousNot describedBifid or toothedBifid with profuse white long hairsSorophore lamina width (mm)Not describedNot described0.5-0.80.5-0.6 wideSporangiaBiseriate with brown hairsBiseriate (sometimes apparently tetraseriate) and glabrousBiseriateBiseriate and glabrousSpore surfaceStriateStriateSmoothSmoothDistributionNortheastern Australia, Indonesia (Borneo, Moluccas), Malaysia (Peninsular Malaysia), Papua New Guinea, Singapore, ThailandIndonesia (Moluccas), Malaysia (Peninsular Malaysia), Micronesia (Ponape)New Caledonia (Sommet du Mont Mi)Philippines (Mindanao)

Published as part of Amoroso, Victor B., Coritico, Fulgent P. & Fritsch, Peter W., 2020, Actinostachys minuta, a new species of grass fern from Mindanao, Philippines, pp. 59 in PhytoKeys 151 on page 59, DOI: 10.3897/phytokeys.151.53100