SUMMARYInfection of new leaves of Pinus ponderosa just emerging from their sheath scales occurs in June. Leaf tissue turns brown within a few weeks. Acervuli appear in September and are probably the imperfect state of Lophodermella morbida. The ascostroma is subhypodermal. Paraphyses and ascogenous hyphal initial cells develop in November from the basal pseudoparenchyma. Croziers form in April, asci develop in April or May, and spores are released from June to August. Cytology within the ascus is typical of Ascomycetes: karyogamy, precocious synapsis, elongation of chromosomes to full pachynema and condensation through diplonema and diakinesis. Divisions II and III are also typical. The mature ascus contains eight uninucleate davate spores. The haploid chromosome number is 8 or 9.
No takes yet. Share an insight, caveat, or question.
Uecker et al. (1973) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: