Document Detail

Complete life cycle of the lichen fungus Calopadia puiggarii (Pilocarpaceae, Ascomycetes) documented in situ: Propagule dispersal, establishment of symbiosis, thallus development, and formation of sexual and asexual reproductive structures.
MedLine Citation:
PMID:  25366850     Owner:  NLM     Status:  In-Data-Review    
PREMISE OF THE STUDY: The life histories of lichen fungi are not well known and cannot be readily studied in laboratory culture. This work documents in situ the complete life cycle of the widespread crustose lichen Calopadia puiggarii, which reproduces sexually and asexually on the surfaces of leaves.•
METHODS: Plastic cover slips held in a mesh frame were placed over leaves in the field and successively removed for microphotography of colonizing lichens.•
KEY RESULTS: Macroconidia produced within campylidia encircled photobiont cells and codispersed with them, a feature not reported previously for C. puiggarii. Dispersed macroconidia readily germinated and lichenized the photobionts. Algal cells were often dislodged from the encircling macroconidia, providing a likely source for the free-living populations observed. Aposymbiotically dispersed ascospores germinated and lichenized nearby algal cells soon after dispersal. Thallus areolae merged readily in early development, although adjacent mature thalli were often separated by growth inhibition zones. Pycnidia are reported for the first time in Calopadia; their pyriform microconidia probably function as male gametes (spermatia). Pycnidia, apothecia, and campylidia began development similarly as darkly pigmented primordia on the fungal prothallus.•
CONCLUSIONS: Abundant dispersal of ascospores, conidia, and photobionts allows C. puiggarii to quickly colonize leaves with the dual advantages of sexual and asexual reproduction, and with the added convenience of having its algal partner on hand. Fusions and prothallic capture of additional algae provide many opportunities for multiple mycobiont and photobiont genotypes to be combined in a single thallus, but the outcomes of such events remain to be explored.
William B Sanders
Publication Detail:
Type:  Journal Article     Date:  2014-10-30
Journal Detail:
Title:  American journal of botany     Volume:  101     ISSN:  1537-2197     ISO Abbreviation:  Am. J. Bot.     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370467     Medline TA:  Am J Bot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1836-48     Citation Subset:  IM    
Copyright Information:
© 2014 Botanical Society of America, Inc.
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