Clade 10: Pseudocercospora

Note: See Crous et al. (2013)

Clade 11: Zymoseptoria

Note: See Quaedvlieg et al. (2011).

Clade 12: Ramularia

Note: See Crous et al. (2009a, c).

Clade 13: Dothistroma

Note: See Barnes et al. (2004).

Clade 14: Stromatoseptoria

Stromatoseptoria Quaedvlieg, Verkley & Crous, gen. nov. MycoBank MB804423.

Etymology: Stroma = referring to central stoma in pycnidium that gives rise to conidiophores; Septoria = septoria-like morphology.

Foliicolous, plant pathogenic. Conidiomata pycnidial, hypophyllous, subglobose to lenticular, very pale brown to dark brown, immersed to erumpent, exuding conidia in white cirrhus; ostiolum central, circular, surrounding cells concolorous; conidiomatal wall composed of a homogenous tissue of hyaline to very pale brown, angular to irregular cells. Conidiophores subcylindrical, branched, hyaline, septate. Conidiogenous cells hyaline, discrete or integrated, cylindrical or narrowly ampulliform, holoblastic, often also proliferating percurrently. Conidia cylindrical, slightly to distinctly curved, broadly rounded apex, attenuated towards a truncate base, transversely euseptate, mostly constricted at septa.

Type species: Stromatoseptoria castaneicola (Desm.) Quaedvlieg, Verkley & Crous.

Notes: Stromatoseptoria is distinguished from Septoria based on the central cushion or stroma that gives rise to its conidiophores (sensu Coniella and Pilidiella; van Niekerk et al. 2004), and conidia that tend to be olivaceous-brown in mass, and also turn olivaceous and verruculose with age.

Stromatoseptoria castaneicola (Desm.) Quaedvlieg, Verkley & Crous, comb. nov. MycoBank MB804424. Fig. 43. Basionym: Septoria castaneicola Desm., Ann. Sci. Nat., Ser. 3, Bot. 8: 26. 1847.

[equivalent to] (?) Phleospora castanicola (Desm.) D. Sacc., Mycoth. Hal., Cent. 1-2, no. 173.

= Septoria gilletiana Sacc., Michelia 1: 359. 1878.

? = Septoria castaneae Lev., Ann. Sci. Nat., Ser. 3, Bot. 5: 278. 1846.

[equivalent to] Cylindrosporium castaneae Krenner, Bot. Kozl. 41(3-4): 126. 1944.

Description in vivo. Leaf spots numerous, small, angular, and often merging to irregular patterns, visible on both sides of the leaf, initially pale yellowish brown, later reddish brown with a narrow, darker border; Conidiomata pycnidial, hypophyllous, several in each leaf spot, subglobose to lenticular, very pale brown to dark brown, usually fully immersed, 80-150(-200) [micro]m diam, releasing conidia in white cirrhi; ostiolum not well-differentiated, central, circular, 18-50 [micro]m wide, surrounding cells concolorous; conidiomatal wall about 10-17 [micro]m thick, composed of a homogenous tissue of hyaline to very pale brown, angular to irregular cells 4-10 [micro]m diam; Conidiophores subcylindrical, branched at base, hyaline, smooth, 1-2-septate; base frequently brown, verruculose. Conidiogenous cells hyaline, discrete or integrated in conidiophores cylindrical or narrowly ampulliform, holoblastic, often also proliferating percurrently with up to 3 closely positioned annellations, 7-17(-20) x 3-4(-5) [micro]m. Conidia cylindrical, slightly to distinctly curved, irregularly bent or flexuous, with a relatively broadly rounded apex, attenuated towards a truncate base, basal and apical cell often both wider than intermediate cells, (0-)2-3(-4)-septate, mostly constricted around the septa in the living state, hyaline, contents with several oil-droplets and granular material in each cell in the living state, with granular contents in the rehydrated state, 3046 x 3-4 [micro]m ("T"; rehydrated, "NT" 2-3 [micro]m wide). Conidia are olivaceous-brown in mass, and older conidia also turn olivaceous and verruculose, and at...