Dear Ken, there is a claimed 350 species of sphagnum moss in the world covering the northern hemisphere and some in the southern hemisphere! But beware for sphagnum moss can potentially harbour the fungi causing the chronic disease sporotrichosis. Sporothrix schenckii spores enter the skin via abrasions, scratches, and small puncture wounds as a result of unprotected contact exposure to Sphagnum moss.
Most peat is produced and purchased in the UK is from Irish sphagnum moss and has a low pH. That is why i use it for my insectivorous/carnivorous plants as the Uk and Ireland has insectivorous plants and some are native and endemic only to our shores!
The biggest amount of sphagnum is in Scotland in the flow country which is a vast area on the west coast of sphagnum moss! i use Scottish sphagnum for my insectivorous plants and especially Drosera's.
New Zealand sphagnum is indeed very good for certain things, and Argentina amongst other south American countries also has it, although I have never seen it!
Regards.
Neil.
p.s. Spanish moss (Tillandsia usneoides) is an air plant. Spanish moss is an epiphyte which absorbs nutrients (especially calcium) and water from the air and rainfall and grows on oak tress normally!