Description, distribution and ecology of endemic Tasmanian quillwort, Isoetes jarmaniae, sp. nov. (Isoetaceae; Lycopodiopsida) Author Brunton, Daniel F. 0000-0002-4671-694X Beaty Centre for Species Discovery and Botany Section, Canadian Museum of Nature, Ottawa, Ontario K 1 P 6 P 4, Canada & dbrunton @ nature. ca; https: // orcid. org / 0000 - 0002 - 4671 - 694 X dbrunton@nature.ca Author Garrett, Michael 0000-0001-6714-9043 Box 49, Bicheno, Tasmania, 7215 Australia & mga 40605 @ bigpond. net. au; https: // orcid. org / 0000 - 0001 - 6714 - 9043 mga40605@bigpond.net.au Author Sokoloff, Paul C. 0000-0002-7053-8557 Beaty Centre for Species Discovery and Botany Section, Canadian Museum of Nature, Ottawa, Ontario K 1 P 6 P 4, Canada & psokoloff @ nature. ca; https: // orcid. org / 0000 - 0002 - 7053 - 8557 psokoloff@nature.ca Author Kantvilas, Gintaras 0000-0002-3788-4562 Tasmanian Herbarium, Tasmanian Museum and Art Gallery, Box 5058, UTAS LPO, Sandy Bay, Tasmania 7005, Australia & Gintaras. Kantvilas @ tmag. tas. gov. au; https: // orcid. org / 0000 - 0002 - 3788 - 4562 antvilas@tmag.tas.gov.au text Phytotaxa 2021 2021-10-05 522 1 27 37 http://dx.doi.org/10.11646/phytotaxa.522.1.3 journal article 4138 10.11646/phytotaxa.522.1.3 c0b26a15-be0c-4473-9af4-e0f8dd180642 1179-3163 5548985 Isoetes jarmaniae D.F.Brunt., G. Kantvilas & M. Garrett , sp. nov. ( Figures 1 , 4 , 5 , 6 ) Diagnosis:— A diminutive species restricted to alkaline seepage areas in Tasmanian buttongrass moorland and most similar to the larger Isoetes drummondii , from which it differs most conspicuously by its strongly recurved leaves, disproportionately large ligules and congested, boldly ornamented regulate-cristate to columnar, slightly triangular megaspores and finely papillate microspores. Type : — AUSTRALIA : Tasmania , Maxwell Valley near Lancelot Hill , 42°31’S 145°55’E , in alkaline pan, 190 m elevation, 26 April 1985 , S . J . Jarman ( holotype HO 314939!; isotype DFB ! [fragment]) . FIGURE 1. Isoetes jarmaniae ; 1A plants in situ , Maxwell River valley (1979); 1B : excavated plants, Prince Rivulet, Maxwell River valley, December 2017. Scale bar = 2 cm. (Photos: J. Jarman). FIGURE 2. Isoetes jarmaniae habitat; 2A : peat-bound karstic wetland in a landscape dominated by buttongrass ( Gymnoshoenus sphaerocephalus ) moorland, Giblin River valley (1979); 2B : peat-bound karstic wetland, surrounded by tall wet scrub, with outcropping dolomite, Maxwell River valley (1984) (Photos: J. Jarman) Description:— PLANTS: short (leaf rosette above corm < 6 cm tall), amphibious, herbaceous ( Figure 1 ), arising from an approximately 0.75−1.00 cm wide, three-lobed corm (rhizomorph); LEAVES: spirally arranged, simple, dull blackish to gray-green with lighter bases, 1.0− 2.3 mm wide at mid-point (dried), thin-walled, typically distinctly flattened and longitudinally folded adaxially in the lower half and terete upwardly (some terete throughout); alae extend approximately 20% length of leaf; small central vascular bundle and narrow internal partitions create four atypically wide air chambers ( Figure 4 ); SPORANGIA: oval, 3.0 × 2.4 mm , inserted into the basal inner side of the leaves, uniformly dark tan to brown; surface unmarked; fenestra complete (no velum coverage) ( Figure 5 ); LIGULE: narrowly long-triangular with obtuse to acute summit, 60–80% length of the sporangium ( Figure 5 ); MEGASPORES: globose body, averaging 660 µm in diameter; congested ornamentation of distinct, thick walled, rugulate-cristate muri (walls) and/or tall, narrow, columnar muri (echinate-like appearance); low papillae evident on distal side of some otherwise smooth-walled, thin, alate equatorial ridges; slightly triangular megaspore shape results from subtle to prominent swellings (‘knobs’) at the intersections of the equatorial ridge with the suture ridges ( Figures 6 A−6D); MICROSPORES: plump, blunt-ended, with obscure to absent dorsal ridge; averaging 35.6 µm long; densely fine-papillate perispore ornamentation ( Figures 6 E-6F); white to light tan en masse . FIGURE 3 : Distribution of Isoetes jarmaniae in Tasmania (adapted from Garrett 1996 ) Distribution and Habitat:— In coarse, peaty quartzite/ silica sand substrate in periodically inundated (flowing) seepage areas over limestone bedrock, with sparse associated vegetation; found only in southwestern Tasmania , Australia . Chromosome Number:— Inferred diploid (2 n =2x=22) by spore size conformity with cytologically confirmed diploid Tasmanian taxa: I. drummondii , I. elatior and I. gunnii ( Marsden 1979 , D.M. Britton pers. comm.). Etymology:— The epithet honours Dr. S. Jean Jarman of Hobart, Tasmania , who first collected this species and recognised it as unique. The vernacular name Limestone Quillwort is suggested, as per Tasmanian State Government (2021) . Paratypes : — Tasmania : tributaries of the Giblin River , E of Lawson Range , 42°56’S 145°44’E , J . Jarman ( HO 31378 !); Maxwell Valley , 42°30’S 145°55’E , 190 m , 26April 1985 , S . J . Jarman ( HO 314082!); Maxwell River , 42°31’S 145°55’E , 200 m , 26 April 1985 , M . J . Brown ( HO 531819!); Middle Giblin River basin, 8 km NW of Mt Gaffney , 43°00’S 145°45’E , 30 m , 17 Feb. 1989 , J . R . Croft 10114 & M . M . Richardson ( AD , CANB , HO !); Alfhild Creek , Giblin River Valley , 43°03’S 145°43’E , Feb. 1989 , L . Gilfedder ( HO 114427!); Giblin River 43.0156°S 145.7467°E , M . Garrett s.n ., 20 February 1994 ( DFB !, OAC ); Giblin River , 42°57’S 145°46’E , 20 m , 8 Jan 2005 , G . Kantvilas & M . Garrett ( HO 531818!); Giblin River valley , 42°56’S 145°45’E , 40 m , 18 Aug. 2016 , M . Visoiu ( HO 591035!); Maxwell River Valley , c. 700 m SW of Prince Rivulet , 42°29’S 145°55’E , 190 m , 12 Dec. 2017 , M . F . de Salas 1915 ( DFB (fragment)!, HO 590554!); Algonkian Rivulet valley , c. 800 m NW of junction with Ridge Creek , 42°27’S 145°57’E , 210 m , 12 Dec. 2017 , M . F . de Salas 1903 ( DFB (fragment)!, HO 590544!); Giblin Valley , c. 2.75 km SE of Pass Hill , 42°56’S 145°45’E , 40 m , 21 Mar 2018 , M . F . de Salas 2005 ( DFB (fragment)!, HO 593072!) .