Pucciniastrum myosotidii McKenzie & Padamsee, 2014

Padamsee, Mahajabeen & Mckenzie, Eric H. C., 2014, A new species of rust fungus on the New Zealand endemic plant, Myosotidium, from the isolated Chatham Islands, Phytotaxa 174 (3), pp. 223-230 : 228-229

Pucciniastrum myosotidii McKenzie & Padamsee , sp. nov. ( Fig. 3 ) MycoBank MB 808525

Type:— NEW ZEALAND. Chatham Islands: Rekohu, Te One, house garden next to Department of Conservation ( DOC) base, on Myosotidium hortensium , 6 Jan 2007, R. E . Beever & L. Guard ( PDD 94473) .

Differs from Pucciniastrum epilobii by its larger urediniospores and its DNA phylogeny.

Telia and teliospores not observed. Uredinia hypophyllous, scattered but mainly grouped, sometimes concentric on spots up to 1.5 cm in diam., spots extend to upper surface of leaf, yellow-orange, orbicular, 0.25–0.5 mm diam., bullate, erumpent, opening initially through an apical pore that soon splits wider, becoming pulverulent. Urediniospores (19–)21–28(–30.5) × (12.5–)14.5–19(–21) μm (mean of 75 spores, 23.8 × 16.3 μm), subglobose, obovoid, broadly ellipsoidal or ellipsoid, sometimes somewhat angular, contents yellow; wall 1–1.5 μm thick, hyaline, echinulate, germ pores obscure.

Etymology:— Named after the host genus, Myosotidium .

Other specimens examined:— NEW ZEALAND. Chatham Islands: Rekohu, Te One, DOC house next to Ranger Station , on M. hortensium , 9 Jan 2007, R. E . Beever ( PDD 94859) ; Rekohu, Te One, DOC house next to Ranger Station , on M. hortensium , 11 Jan 2007, L . Guard ( PDD 94555) ; Rekohu, Henga , Admiral farm, on M. hortensium , 7 Jan 2007, R. E. Beever ( PDD 94860) ; Rekohu, Te One, DOC Nursery and nearby house garden, on M. hortensium , 20 Jun 2007, B . Gibb & L . Guard ( PDD 92565) ; Rekohu, Te One, front of DOC office ( PDD 92566, 92567 ); Rekohu , Te One , on M. hortensium , 20 Sep 2007, P. J . de Lange ( PDD 93251, epitype, designated here) .

Note:— Only one other species of Pucciniastrum , P. epilobii (syn. P. pustulatum ), has been recorded from New Zealand, on several genera within the Onagraceae . Pucciniastrum epilobii has smaller urediniospores (15–24 × 10–15 um; Cunningham 1931) than those of P. myosotidii , although in the current molecular analysis the two species lie within sister clades.

Pucciniastrum symphyti (DC.) McKenzie & Padamsee , comb. nov. MycoBank MB 808526

≡ Uredo symphyti DC., Encycl. Méth. Bot. 8: 232. 1808; basionym.

≡ Melampsorella symphyti (DC.) Bubák, Ber. dt. Bot. Ges. 21: 356. 1903.

≡ Caeoma symphyti (DC.) Schltdl., Fl. berol. (Berlin) 2: 122. 1824.

≡ Erysibe symphyti (DC.) Wallr., Fl. crypt. Germ. (Norimbergae) 2: 200. 1833.

≡ Trichobasis symphyti (DC.) Lév., Orbigny Dict. Univ. Hist. Nat. : 785 [19 extr.]. 1849.

≡ Coleosporium symphyti (DC.) Fuckel , in Kickx, Fl. Crypt. Flandres (Paris) 2: 88. 1867.

≡ Thekopsora symphyti (Bubák)Berndt,Untersuchungen zur Ultrastruktur undAnatomie der Melampsoraceen(Uredinales,Basidiomycetes): 198. 1993.

≡ Thekopsora symphyti (Bubák) J. Müll., Czech Mycol. 62: 97; 2010.

Figures

FIGURE 3. Phylogram obtained from maximum likelihood analysis of nuclear rDNA loci, LSU and SSU. Bootstrap support values (> 50%) from a maximum likelihood search with 1000 replicates shown.