Download Copy a link to this page Cite this record

Hypoderma cookianum P.R. Johnst. 1990

Scientific name record
Names_Fungi record source
Is NZ relevant
This is the current name
This record has collections
This record has descriptions
This is indigenous
Threat status: Data deficient
Show more

Click to collapse Details Info

Hypoderma cookianum P.R. Johnst., New Zealand J. Bot. 28 171 (1990)
Hypoderma cookianum P.R. Johnst. 1990

Click to collapse Biostatus Info

Endemic
Present
New Zealand
Political Region

Click to collapse Nomenclature Info

P.R. Johnst.
P.R. Johnst.
1990
171
ICN
Hypoderma cookianum P.R. Johnst. 1990
NZ holotype
species
Hypoderma cookianum

Click to collapse Classification Info

cookianum

Click to collapse Descriptions Info

Hypoderma cookianum P.R. Johnst. 1990

PDD 54866 - Holotype, PDD 48455 (IMI 336651).
Ascomata and conidiomata developing on fallen leaves, within pale, yellowish areas. These areas often surrounded by narrow, black zone lines. In surface view ascomata 0.8-1.5 x 0.4-0.7 mm, oblong-elliptic in outline, ends broadly rounded. Immature ascomata with black walls, with a narrow paler zone along the future line of opening, and well developed paler zones immediately inside the edge of the ascomata, especially toward the ends. Ascomata opening by a single longitudinal slit, lacking any obvious differentiated cells along the edge of the opening. Conidiomata circular in outline, 0.2 mm diam., pale brown, darker around outside edge, immersed.

Ascomata subcuticular. In vertical section upper wall of unopened ascomata up to 45-60 µm thick, narrower toward the outside edge and near the centre of the ascomata. Upper wall comprising mostly dense, black tissue with no obvious cellular structure, but with brown to pale brown, angular cells at the narrow, central part of wall. The inside of this central part of the wall is lined with a few thin-walled, hyaline cells. In opened ascomata the upper wall is up to 60-90 µm thick, slightly thinner toward the ascomatal opening and toward the edge of the ascomata. There is no well-differentiated, persistent zone of paler cells lining the exposed face of the broken upper wall. Lower wall 30-45 µm thick, of 5-10 rows of angular cells, brown to dark brown and thick-walled toward the outside of the wall, hyaline and thin-walled toward the inside.

Paraphyses 1.5-2.0 µm diam., undifferentiated at the apex, barely extending beyond asci. Asci 130-175 x 11-13 µm, clavate, becoming clavate-stipitate immediately prior to spore release tapering slightly to the broadly truncate to somewhat rounded apex, wall often with a small pore at the apex, 8spored. Ascospores bifusiform, 22-33 x 3.5-5.0 µm (average 24.5 x 4.1 µm), broadly rounded apex, tapering toward base, constricted to 1.0-1.5 µm diam. near middle of the spore, surrounded by a narrow gelatinous sheath.

Conidiomata subcuticular. In vertical section the upper wall is 3-5 µm thick, comprising brown to pale brown material with no obvious cellular structure. Lower wall 5-10 µm thick, comprising 2-3 rows of angular cells, outer layers of cells brown, inner layers hyaline. Conidiogenous cells develop on the innermost cells of lower wall, 8-15 x 2-3 µm, cylindric, solitary, proliferating sympodially, often with two developing conidia at apex. Conidia 4-6 x I µm, cylindric, ends rounded, straight, 0-septate, hyaline.

Coromandel, North Canterbury.
Dead leaves of Phormium cookianum.
Ascocarpi elliptici, atri; ascocarpi ruptus paries superior sine cellulis cylindricis in superficie exposita. Asci 130-175 x 11-13 µm, clavati vel clavati-stipitati; ascosporae 22-33 x 3.5-5 µm, bifusiformes, apex rotundatus, convergentes versus basim rotundatam.

ETYMOLOGY: named after host substrate.

NOTES: Ascomatal shape and ascospore shape distinguish this species from H. cordylines, also found on Phormium in New Zealand.

See also notes under H. carinatum.

COROMANDEL, Little Barrier I., Summit Ridge, On Phormium cookianum Le Jolis, coll. P. R. Johnston (LB68), 13 Jun 1984 (PDD 54866).

Click to collapse Taxonomic concepts Info

Hypoderma cookianum P.R. Johnst. 1990
Hypoderma cookianum P.R. Johnst. (1990)
Hypoderma cookianum P.R. Johnst. 1990
Hypoderma cookianum P.R. Johnst. (1990)
Hypoderma cookianum P.R. Johnst. 1990
Hypoderma cookianum P.R. Johnst. (1990)
Hypoderma cookianum P.R. Johnst. 1990
Hypoderma cookianum P.R. Johnst. (1990)

Click to collapse Collections Info

Hypoderma cookianum P.R. Johnst. 1990
New Zealand
Coromandel
Hypoderma cookianum P.R. Johnst. 1990
New Zealand
North Canterbury

Click to collapse Metadata Info

1cb18e70-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
10 September 1993
15 December 2003
Click to go back to the top of the page
Top