Notothylas

Cargill, D. Christine, 2016, Rare and peculiar hornworts: Notothylas orbicularis and N. javanica (Notothyladaceae), new genus and species records for Australia, Phytotaxa 275 (1), pp. 1-13 : 2

Key to Notothylas in Australia

1. Plants without sporophytes................................................................................................................................................................2

- Plants with sporophytes on ventral (or possibly dorsal) surface of the thallus ................................................................................ 3

2. Plants up to 3 cell layers thick, androecia with one antheridium per cavity, antheridia white ................... 2. Notothylas orbicularis

- Plants up to 11 cell layers thick, androecia with up to 4 antheridia per cavity, antheridia yellow-orange ..... 1. Notothylas javanica

3. Sporophytes enclosed in a cylindrical involucre, epidermal cells of capsule isodiametric (25–77.5 x 15–55 μm) thick-walled (5– 12.5 μm wide) and with a variable but often comparatively large lumen (2.5–27.5 μm in width), columella absent, spores yellow, spore distal surface with a central protuberance, pseudoelaters absent .......................................................... 1. Notothylas javanica

- Sporophytes enclosed in an asymmetric, highly dissected involucre, epidermal cells elongate (37.5–100 x 15–32.5 μm), thick-walled with a narrow lumen (5–12.5 μm), columella present, spores yellow to brown, spore dorsal surface without a central protuberance, pseudoelaters present ........................................................................................................... 2. Notothylas orbicularis