Coccomyces radiatus Sherwood 1980

Caption:

Details

Name scientific

Coccomyces radiatus Sherwood 1980

Preferred name

Coccomyces radiatus Sherwood 1980

Biostatus

Origin

Occurrence

Georegion

Schema

Biostatus source

Comment

Indigenous, non-endemic

Present

New Zealand

Political Region

Anon

Nomenclature

Authors

Sherwood

Original authors

Sherwood

Publication place

Sherwood, M.A. 1980: Taxonomic studies in the Phacidiales: the genus Coccomyces (Rhytismataceae). Occasional Papers of the Farlow Herbarium of Cryptogamic Botany. 15.

Year published

1980

Publication page

Nomenclatural code

ICN

Basionym

Coccomyces radiatus Sherwood 1980

Type locality

VA, USA

Taxonomic rank

species

Canonical form

Coccomyces radiatus

Typification

Type USA

Classification

Kingdom

Fungi

Phylum

Ascomycota

Class

Leotiomycetes

Order

Rhytismatales

Family

Rhytismataceae

Genus

Coccomyces

Species

radiatus

Associations

View full associations record

Association type

Associated organism

Association source

has host

Cordyline

Johnston, P.R. (1986)

has host

Astelia

Johnston, P.R. (1992)

has host

Knightia excelsa R.Br.

Lantz, H.; Johnston, P.R.; Park, D.; Minter, D.W. (2011)

has host

Metrosideros fulgens Gaertn.

McKenzie, E.H.C.; Buchanan, P.K.; Johnston, P.R. (1999)

has host

Nothofagus menziesii (Hook.f.) Oerst.

McKenzie, E.H.C.; Buchanan, P.K.; Johnston, P.R. (2000)

has host

Agathis australis (D.Don) Lindl.

McKenzie, E.H.C.; Buchanan, P.K.; Johnston, P.R. (2002)

isolated from

Acacia koa

ICMP (3 records from [Not available].)

isolated from

Knightia excelsa R.Br.

ICMP (1 records from [Not available].)

isolated from

Metrosideros polymorpha

ICMP (2 records from [Not available].)

isolated from

Nothofagus menziesii (Hook.f.) Oerst.

ICMP (1 records from [Not available].)

isolated from

Nothofagus moorei (F.Muell.) Krasser 1896

ICMP (4 records from [Not available].)

isolated from

Rhynchospora Vahl 1805

ICMP (1 records from [Not available].)

isolated from

Richea

ICMP (1 records from [Not available].)

has host

Acacia koa

PDD (3 records from [Not available].)

has host

Agathis australis (D.Don) Lindl.

PDD (1 records from [Not available].)

has host

Cordyline

PDD (1 records from [Not available].)

has host

Cyathodes fasciculata

PDD (1 records from [Not available].)

has host

Dicksonia squarrosa (G.Forst.) Sw.

PDD (1 records from [Not available].)

has host

Dracophyllum pyramidale W.R.B.Oliv.

PDD (1 records from [Not available].)

has host

Dracophyllum sinclairii Cheeseman

PDD (1 records from [Not available].)

has host

Dracophyllum traversii Hook.f.

PDD (4 records from [Not available].)

has host

Gaultheria paniculata B.L.Burtt & A.W.Hill 1935

PDD (1 records from [Not available].)

has host

Ilex integra Thunb.

PDD (1 records from [Not available].)

has host

Knightia excelsa R.Br.

PDD (16 records from [Not available].)

has host

Leptospermum scoparium J.R.Forst. & G.Forst.

PDD (1 records from [Not available].)

has host

Litsea calicaris (A.Cunn.) Kirk

PDD (1 records from [Not available].)

has host

Macadamia

PDD (1 records from [Not available].)

has host

Metrosideros

PDD (1 records from [Not available].)

has host

Metrosideros collina

PDD (1 records from [Not available].)

has host

Metrosideros fulgens Gaertn.

PDD (1 records from [Not available].)

has host

Metrosideros polymorpha

PDD (2 records from [Not available].)

has host

Nothofagus cunninghamii

PDD (1 records from [Not available].)

has host

Nothofagus menziesii (Hook.f.) Oerst.

PDD (5 records from [Not available].)

has host

Nothofagus moorei (F.Muell.) Krasser 1896

PDD (6 records from [Not available].)

has host

Rhododendron

PDD (1 records from [Not available].)

has host

Rhynchospora Vahl 1805

PDD (1 records from [Not available].)

has host

Richea continentis B.L.Burtt

PDD (1 records from [Not available].)

has host

Rubus

PDD (1 records from [Not available].)

has host

Rubus cissoides A.Cunn.

PDD (6 records from [Not available].)

has host

Weinmannia racemosa L.f.

PDD (2 records from [Not available].)

Descriptions

Johnston, P.R. 1986: Rhytismataceae in New Zealand. 1. Some foliicolous species of Coccomyces de Notaris and Propolis (Fries) Corda. New Zealand Journal of Botany 24(1): 89-124.

Coccomyces radiatus Sherwood 1980

Collections Examined

New Zealand: NORTHLAND: Puketi S.F., Picnic Area, Bush Walk, on Knightia excelsa, P. R. Johnston, G. J. Samuels, 16.IV.1982 (PDD) 44688). AUCKLAND: Waitakere Ra., Piha Valley, Cowan Track, on Rubus cissoides A. Cunn., P. R. Johnston, G. J. Samuels, R. H. Petersen, 27.IV.1983 (PDD 44687); Waitakere Ra., Swanson, University Hut, on Knightia excelsa, P. R. Johnston, 31.111.1983 (PDD 44686); Waitakere Ra., Kauri Knoll Track, on Dracophyllum latifolium A. Cunn., P. R. Johnston, E. M. Gibellini, IO.VII.1983 (PDD 44678); Waitakere Ra., Walkers Bush Track, on Cordyline sp., P. R. Johnston, G. J. Samuels, E. H. C McKenzie, 4.VIII.1982 (PDD 44689); Beachhaven, on Dracophyllum sp., P. R. Johnston, 30.X.1983 (PDD 44681); Waitakere Ra., Sharps Bush, on Leptospermum scoparium, P. R. Johnston, 14.XI.1983 (PDD 44680); Waitakere Ra., Kauri Knoll Track, on Dracophyllum latifolium, P. R. Johnston, 28.XI.1983 (PDD 44679). COROMANDEL: Papa Aroha, Rautawhake Stream, on Metrosideros fulgens, P. R. Johnston, E. M. Gibellini, 12.VIII.1984 (PDD 45363); Little Barrier Island, vic. E. Cape, 100 in., Track 16, on Knightia excelsa, P. R. Johnston, R. E. Beever, E. P. Laracy, 16.VI.1984 (PDD 47066). TARANAKI: Mt. Egmont, Puniho Track, on Weinmannia racemosa, P. R. Johnston, G. J. Samuels, R. H. Petersen, 25.IV.1983 (Pt)D 44685); ibid., on Knightia excelsa (PDD 44684). NELSON: Mt. Dunn Walkway, on Weinmannia racemosa, P. R. Johnston, G. J. Samuels, R. H. Petersen, R. E. Beever, 20.IV.1983 (PDD 44683). WESTLAND: Fox Glacier, Minehaha Track, on Dicksonia squarrosa, P. R. Johnston, G. J. Samuels, R. E. Beever, 8.IV.1983 (PDD 44682); Haast Pass, Robinsons Creek, on Nothofagus menziesii, P. R. Johnston, G. J. Samuels, R. H. Petersen, R. E. Beever, 12.IV.1983 (PDD 43961).

North America: USA: Virginia, Dismal Creek, on Rhododendron sp., C. L. Shear, 16. X. 1935 (Holotype, BPI).

Description

Ascocarps found on fallen leaves, more commonly on lower surface, in pale brown to yellow lesions. Lesions not associated with zone lines. Ascocarps 5-6 sided, more or less round in outline, 0.5-1 mm diam. Upper wall black to dark grey with broad, pale zones along future lines of opening, or more or less concolorous with surrounding host tissue, apart from narrow, black line marking edge of ascocarp. Opening by 4-6 splits in the covering layer, with the folded-back flaps of tissue often eroding to widely expose the yellow hymenium. No lip cells. Pycnidia absent.

Ascocarps subepidermal. In vertical section upper stromatal layer 10-12 µm wide, of three to four layers of pale brown to hyaline cells, thin walled. rounded, 2.5-5 µm diam. Lower stromatal layer 20-30 µm wide, of three to four layers dark brown, more or less globose cells, thick walled, up to 8 µm diam. Subhymenium 20-30 µm wide, of hyaline, thin walled cells. Excipulum developing from the marginal paraphyses. Excipular elements becoming swollen, 4-5 µm diam., and closely septate near apices, septa 4-10 µm apart.

Paraphyses 2 µm diam., swollen to 4-6 µm diam. at the clavate apices, embedded in yellow gel, extending 15-20 µm beyond asci. Asci cylindric. 102-156 x 4.5-6.5(-7) µm, apex rounded wall thickened to 1.5-2.5 µm at apex with a small central pore, non-amyloid, 8-spored. Ascospores filiform, (77-)88-108 x 1-1.8 µm, tapering to one end, 0-1 septate, more or less straight when released, distinct gelatinous sheath.

CHARACTERISTICS IN CULTURE: A low percentage of the ascospores of PDD 43961 and PDD 44685 germinated on agar plates. Colonies on oatmeal agar 5-8 cm diam. after 10 weeks; aerial mycelium dense, erect, cottony, white, with small, scattered patches of black, stringy hyphae; agar not discoloured. Remaining sterile.

Habitat

Found in New Zealand on fallen leaves of a wide range of host plants, including Knightia excelsa, Dracophyllum species, Weinmannia racemosa, Leptospermum scoparium J. R. et G. Forst., Dicksonia squarrosa, Metrosideros fulgens, and Nothofagus menziesii. Previously known from North and South America on Rhododendron species and other, unidentified hosts (Sherwood 1980).

Notes

The collections of this species from New Zealand were indistinguishable from the type specimen of C. radiatus in both macroscopic and microscopic appearance. Sherwood (1980) described the ascospore length as 60-75 µm. In my study of the type specimen ascospores of up to 98 µm long were seen. This matched spore lengths from the New Zealand collections. C radiatus is often found mixed on the same leaf with other Rhytismataceous taxa, and various species belonging to Lophodermium and Hypoderma.