Book  (1837)  Page(s) 10.  
 
Rivers's Single Moss is inclined to be semi-double. This is a remarkably luxuriant grower, as is the Single Crimson Moss, a seedling which bloomed for the first time in the season of 1836...

Website/Catalog  (1837)  Page(s) 4.  
 
Moss Roses (Rosa centifolia muscosa).
Single (Rivers's)... rose colour... globular and distinct.

Magazine  (1 Nov 1835)  Page(s) 243.  
 
A Description of Roses. By Mr. T. Rivers, jun., Nurseryman, Sawbridgeworth, Hertfordshire.
In attempting a descriptive catalogue of Roses, I hope to be excused errors, which it seems almost impossible wholly to avoid. Roses vary so much in their form and colour in different seasons and situations, as sometimes scarcely to be recognised... what I hope to accomplish is, to give an idea of what they ought to be in form and colour, under favourable circumstances of soil and situations; and where there is so much confusion as at present in the names and arrangement of Roses, to be among the first in attempting a correct nomenclature.
MOSS ROSES.
Single (Rivers's), very bright rose colour, globular and distinct.

The following terms are used to express the form of the Flower:
Globular.—The outer petals encircling the flower till fully blown, in the manner of the common Cabbage or Provence Rose.