Duncan, take a look at the species in these products. None of them seem to contain known fungi for orchids. When you are looking at the list, the following genus is known to form mycorrhizae with photosynthetic orchids (I'm excluding myco-heterotrophic orchids, which seems to be able to use quite different kinds of fungi). I'm grouping them based on the larger grouping (Order and family). I think I compiled this from
Rasmussen, H. N. 2002, Recent developments in the study of orchid mycorrhiza. Plant and Soil 244(1): 149-163. (
link to abstract, which might not work).
## Order: Cantharellales, Family: Ceratobasidiaceae
Ceratobasidium
Rhizoctonia
## Order: Cantharellales, Family: Hydnaceae
Sistotrema
## Order: Sebacinaceae, Family: Sebacinaceae
Serendipity
## Order: Agaricales, Family: Mycenaceae
Mycena
## Order: Tulasnellales Family: Tulasnellaceae
Tulasnella
Epulorhiza
Most of the fungi seem to be sporophytic (breaks down organic matters), but you might notice that some of them can be plant pathogens. For example, Rhizoctonia repens is a mild pathogen for most plants, but they forms mycorrhiza with orchids (documented with Cymbidium goeringii).
Here is a
link to a newer review:
Dearnaley, John (2007). Further advances in orchid mycorrhizal research. Mycorrhiza, 17 (6): 475-486. ISSN 0940-6360.