Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
![Fig 8 P. macrostoma var. macrostoma. Colonies on OA (left) and ME (right) after growing for 7 days in the dark and 4 days in the light at 20°C. © All rights reserved. [Image: AN6]](https://data.landcareresearch.co.nz/Image/AN6/SysPortalThumb)
![Fig 8 P. macrostoma var. macrostoma. Colonies on OA (left) and ME (right) after growing for 7 days in the dark and 4 days in the light at 20°C. © All rights reserved. [Image: AN6]](https://data.landcareresearch.co.nz/Image/AN6/SysPortalPreview)
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Details
Didymella macrostoma (Mont.) Q. Chen & L. Cai in Chen et al., Studies in Mycology 82 177 (2015)
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Nomenclature
(Mont.) Q. Chen & L. Cai
Mont.
Q. Chen & L. Cai
2015
177
ICN
species
Didymella macrostoma
Classification
Synonyms
Associations
View full associations recordhas host
has host
isolated from
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Descriptions
Brien (1934) described this fungus from apple fruit held in cold store in New Zealand. Ainsworth and Bisby (1961) stated that the genus Polyopeus Horne is synonymous with Phoma. Unfortunately no herbarium material was kept from Brien's studies. In recent researches on apple fruit rots (Brook 1960; Cooper and Padfield, 1965) it has not been recorded. It is suggested that the name in New Zealand could have been confused with the Phomopsis stage of Diaporthe perniciosa.
Type: Foliicolous Fungi; Description: Conidiomata pycnidial, scattered to gregarious, immersed to superficial, globose to subglobose, rusty brown to black, 0.1–0.3 mm in diameter, with a distinct large (10–30 μm in diameter) ostiole; on leaf spots or on necrotic tissue of other plant parts. Conidia ellipsoid to oval, 0-septate (rarely 1-septate), 4–8 × 2–4 μm, smooth, hyaline.
Distribution: Northland, Auckland, Bay of Plenty, Wanganui.; 1st Record: Cunningham (1921: as Phoma pomi).
Significance: Causes a leaf spot of minor importance in Eriobotrya japonica (loquat) and spotting of apples (Dingley 1969).; Host(s): Actinidia deliciosa, Eriobotrya japonica, Magnolia sp., Malus ×domestica.
REPRESENTATIVE CULTURES: PDDCC 6628, 6629, 6814.
COLONY MORPHOLOGY OA: Colonies 40-70 mm diam. after 7 days. Mycelium; sparse, cottony or stringy, white to pale grey; numerous pycnidia with orange conidial ooze scattered over colony surface and often forming a densely aggregated band half-way between centre and edge of colony. Reverse; pale grey or colourless. ME: Colonies 30-60 mm. Mycelium; sparse, white to pale grey or pale olivaceous, pycnidia scattered, over whole colony, often with a more closely grouped band at the colony edge. Reverse; colourless, pale olivaceous or yellow, pycnidia showing through as dark spots or as orange spots if oozing conidia. CHLAMYDOSPORES: None. CONIDIA: Variable in size and shape, occasionally 1-septate. (5-)6-8(-11) x (2-)2.5-3.5(-4) µm. PYCNIDIA: Often with several ostioles, solitary or aggregated into groups with adjacent pycnidia having confluent walls.
OCCURRENCE: Common and plurivorous. Saprophyte or weak wound parasite.
REPRESENTATIVE CULTURES: PDDCC 6603, 6803.
COLONY MORPHOLOGY OA: Colonies 50-70 mm diam. after 7 days. Mycelium; cottony to stringy, white or olivaceous with a red tinge. Numerous pycnidia on agar surface, often with buff coloured conidial slime. Reverse; bright yellow or red. ME: Colonies 40-50 mm. Mycelium; cottony, grey, olivaceous, or reddish; concentric bands of pycnidia forming at edge of colony. Reverse; rust coloured. CHLAMYDOSPORES: None. CONIDIA: Variable in shape, often irregular, occasionally 1-septate. (4.5-)6-9(-12) x (2-)2.5-3.5(-4) µm. PYCNIDIA- Often with several ostioles, solitary or aggregated into groups of 5-10 with adjacent pycnidia having confluent walls.
OCCURRENCE: Plurivorous saprophyte or weak wound parasite, more commonly found on woody plants.
Taxonomic concepts
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Phoma macrostoma Mont.
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Phoma macrostoma Mont. (1849)
Phoma macrostoma Mont. (1849)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. 1970
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma var. incolorata (A.S. Horne) Boerema & Dorenb. (1970)
Phoma macrostoma Mont. var. macrostoma (1849)
Phoma macrostoma Mont. 1849 var. macrostoma
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Phoma macrostoma Mont. var. macrostoma (1849)
Phoma macrostoma Mont. var. macrostoma (1849)
Phoma macrostoma Mont. var. macrostoma (1849)
Phoma macrostoma Mont. var. macrostoma (1849)
Polyopeus purpureus var. incoloratus A.S. Horne
Didymella macrostoma (Mont.) Q. Chen & L. Cai 2015
Collections
Metadata
387742e6-6901-481a-9981-699c894b4178
scientific name
Names_Fungi
22 November 2016
22 November 2016
