Ramomarthamyces dracophylli (P.R. Johnst.) P.R. Johnst. 2019
Details
Nomenclature
Classification
Associations
Descriptions
Ascocarps deeply immersed in hypodermal tissue. In vertical section more or less orbicular in shape. Upper wall poorly developed, comprising 3-4 layers of hyaline, gelatinised hyphae, 2.5-4 µm diam. Inside of wall lined with a layer of unbranching periphyses, 8-10 x 2-3 µm. Crystals form amongst the periphyses and wall hyphae near the top of the margin. Lower wall not present, subhymenium 10-20 µm wide, forming directly on disintegrating host tissue.
Paraphyses 0.8-1.2 µm diam., propoloid, tangled together, intermixed with crystals near the apices, often anastomosing near bases, extending 15-20 µm beyond asci. Asci 114-147 x 7.5-9 µm, cylindric, tapering to the small truncate, or broadly rounded, apex, non-amyloid, 8-spored. Ascus wall thickened near apex, with a broad, central pore. Ascospores filiform, not tapering, often coiling on release, 80-112 x 1.2-1.5 µm, 0-1 septate, with a gelatinous cap at both ends.
CHARACTERISTICS IN CULTURE: Ascospores germinated on agar plates after 2-3 days. Colonies on oatmeal agar 2-3 cm diam. after 8 weeks; aerial mycelium white, cottony, erect; agar pink, with yellow patches near edges of colony. Remaining sterile.
ETYMOLOGY: dracophylli; refers to host plant.
NOTES: The structure of the ascocarp margin and the appearance of the ascus apex of this species are similar to those of some Ostropalean genera such as Stictis and Propolidium. However 0-1 septate ascospores with a gelatinous sheath, and anastomosing paraphyses are distinctive Rhytismataceous characters. The external appearance of the ascocarp conforms to that of Propolis.