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 Colpoma agathidis
BiostatusPresent in region - Indigenous. Endemic
Images (click to enlarge)
Caption: Fig. 1 Colpoma agathidis (PDD 21518): A, margin of ascoma in vertical section. B, asci. C,
apex of asci and paraphyses. D, released ascospores. | 
Caption: Fig. 5 Colpoma agathidis (PDD 21518): macroscopic appearance of ascomata. Scale = 1
mm. | 
Caption: collection from Campbell Island
Owner: Peter Johnston | 
Caption: type collection
Owner: Peter Johnston | 
Owner: Herb. PDD | 
Owner: Peter Johnston |
Article: Johnston, P.R. (1991). Rhytismataceae in New Zealand. 5. Wood- and bark-inhabiting species in the genera Colpoma and Propolomyces. New Zealand Journal of Botany 29: 405-410 (http://www.rsnz.org/publish/abstracts.php).
Description: Ascomata 0.6-1 x 0.3-0.5 mm, broad-elliptic to oval in outline, erumpent from surface of bark,
surface of the ascomatal wall covered with bright yellow- or orange-coloured material with a
crystalline appearance, opening by a single longitudinal slit, the edge of the slit grey to dark
grey in colour. Not associated with anamorph conidiomata.
Ascomata in vertical section with an upper wall up to 110 µm thick, comprising
mostly brown to pale brown, slightly thick-walled, angular cells , but with dark brown, thick-walled cells along the outside of the wall, adjacent to the host tissue. The part of the wall
adjacent to the ascomatal opening is lined with an extensive layer of thin-walled, cylindric, 3-5
µm diam., elements forming a palisade-like layer up to 100 µm wide in places. This layer is
partially and irregularly covered with a deposit of yellowish, granular material. Lower wall
15-20 µm thick, of several layers of angular to cylindric cells, the outermost 1-2 layers of cells
dark brown and thick-walled.
Paraphyses with anastomoses near the bases, 1.5-2 µm diam., more or less
undifferentiated at apex, extending 10-20 µm beyond asci. Asci 140-180 x 17-20 µm, clavate,
tapering to broad, subtruncate apex, wall undifferentiated at apex, nonamyloid, 8spored,
spores confined to upper 90-110 µm of ascus, ascus development sequential. Ascospores 17-25 x 5-7.5 µm, elliptic, (0-)1 septate, hyaline, surrounded by a 2-5 µm thick gelatinous sheath.
Habitat: fallen bark on Agathis australis.
Distribution: New Zealand: Auckland.
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