Freshwater Ascomycetes - Species Monograph
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| Genus |
Species |
Author |
| Phaeosphaeria |
typharum |
(Desm.) L. Holm, Symb. Bot. Upsal. 14: 126. 1957. |
| Class |
Order |
Family |
| Dothideomycetes |
Pleosporales |
Phaeosphaeriaceae |
|
| Synonymy: |
Basionym =_Sphaeria scirpicola DC. var typharum Desm., Plantes Crypt. France, ed. 2. No. 1778. 1849.
Basionym =_Sphaeria typharum (Desm.) Raben., Herb. Myc. ed. 2, No.731. 1858.
Basionym =_Pleospora typharum (Desm.) Fckl., Symb. Mycol., p.137. 1870.
Basionym =_Leptosphaeria typharum (Desm.) Karst., Mycol. Fenn. 2: 100. 1873.
= Leptosphaeria kunzeana Berl., Icon. Fung. 1:66. 1892.
= Sphaeria perpusilla Desmaziéres, var. typhae Auerswald in Rabenhorst, fungi europaeae, 831, 1865, nom. nud. |
Description
|
| Habit: |
Ascomata on dead stems of Typha, scattered, immersed under the epidermis. |
|
| Ascomata: |
Ascomata 117–132 x_93.5–114.5 µm, scattered, immersed, appearing as small dots under epidermis, ovoid or globose, with a short beak, dark brown. |
|
| Peridium: |
Peridium 12–15.5 µm thick, 3 layers of large pseudoparenchymatic cells, 6–10 x 4–6 µm, of textura angularis in longitudinal section and face view, darker toward the outside and hyaline toward inside. |
|
| Beak: |
Beak 5–10 x 27–43 µm, central, intra-epidermal, without periphyses. |
|
| Hamathecium: |
Pseudoparaphyses cellular, numerous, 2–3.5 µm thick. |
|
| Ascus: |
Asci (-70) 93.5–152 x 20.5–27 µm, fissitunicate, broadly cylindrical to clavate, tapering to a short hoof-shaped stipe, fasciculate, basal. |
|
| Ascospore: |
Ascospores 24–29 x 8–10 µm, broadly fusiform, straight or at times slightly curved, reddish brown to olivaceous, thick-walled, constricted at the first and second septa, with second cells slightly enlarged, possessing a gelatinous sheath that does not stain with India ink. |
|
| Sheath: |
Gelatinous sheath surrounding the ascospore; sheath not staining in India ink. |
|
| Appendage: |
Not observed. |
|
| Culture: |
|
| Anamorph: |
The anamorph Scolecosporiella typhae (Oudem.) Petrak was associated with this fungus (Sivanesan 1984), but an anamorph was not observed in our collections cited below. |
|
Other info
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| Type & Location: |
|
| Other Specimens: |
USA. WISCONSIN: Vilas Co., Trout Lake, UTM Zone 16, 293196mE, 5098921mN, 46°00.838ÕN, 89°40.283ÕW, on submerged, partially decomposed stems of Typha latifolia, 16 May 1995, PMF P1-4 (ILLS 54057); Allequash Lake, UTM Zone 16, 296454mE, 5101163mN, 46°2.032ÕN, 89°37.825ÕW, on submerged dead stems of T. latifolia, 16 May 1995, PMF & JLC P4-6 (ILLS 54053); 28 May 1996, PMF P4-16 (ILLS 54054); 23 Nov. 1996, PMF & JLC P4-46 (ILLS 54058); 1 May 1997, PMF & JLC P4-50 (ILLS 54056); 24 May 1997, PMF & JLC P4-56 (ILLS 54052); 21 June 1997, PMF & JLC P4-58; Sparkling Lake, UTM Zone 16, 291184mE, 5099214mN, on submerged dead stems of T. latifolia, 16 May 1995, PMF P2-9 (ILLS 54055); Big Muskellunge Lake, UTM Zone 16, 297663mE, 5097935mN, 46°00.306ÕN, 89°36.801ÕW, on submerged dead stems of T. latifolia, 16 May 1995, PMF P3-12 (ILLS 54051); 28 Oct. 1995, PMF P3-37; Crystal Bog, UTM Zone 16, 298235mE, 5098282mN, 46°00'422"N, 89°36'361W, on submerged dead grass stem, 1 May 1997, PMF & JLC P5-31; Crystal Lake, UTM Zone 16, 297618mE, 5097887mN, 46°00.280N, 89°36.835'W, on a submerged partially decomposed macrophyte, 28 May 1996, PMF P7-10 (ILLS 54050). |
| Substratum: |
Typha sp. |
| Habitat: |
Lentic. |
| Distribution: |
North America (Wisconsin), temperate Europe, India. |
| Pertinent Literature: |
Fallah & Shearer 2001. |
| Comments: |
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Additional Pictures
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Fig. 1, bar = 50 µm; Figs. 3, 3, bar = 25 µm; Fig. 4, bar = 50 µm; Figs 5–7, bar = 25 µm.
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