Hi Lee & All,  I can only find 2 references to Brs. arachnoidea. The first is 
by Norris Williams Thesis in 1972 were he puts it under Sec. heading "Obscure & 
Excluded Species. Known only from the type description and drawing in Mart.  
Fl.  Bras.  iii. V1. 97 {1904 1906}
  Eric Christenson's answer to the same question I had was a photo copy of the 
type species of Reichenbach's description of the plant in Vienna . He also 
mentioned that there was a copy in the Nat. Col. Orch. 1:53. #37. It seem to 
have a different callus to most of the Brs.been closed at the front and a semi 
circle at the back. I included his quote.
  "All we have are the original drawings and text. There are no known actual 
specimens preserved by Barbosa Rodrigues. Fortunately his drawings/watercolors 
were done life-size so measurements are available. So, from Cogniaux's 
treatment in Flora Brasiliensis:
arachnoidea - pseudobulbs 10-11 x 3-3.5 cm; leaves 20-25 x 5-5.5 cm; 
inflorescences 40 cm long; dorsal sepal 4-5 cm long; lateral sepals 6-7 cm 
long; petals 3.5-4.5 cm long; lip 3.5-4 x 1.5 cm."

I do have a CD on Brassias/Ada that covers about 90% of the known Species. All 
of the plants are grown and Photographed by me. It is not intended to be a 
scientific paper but 1 persons struggle over the past 20+ years trying to find 
information. It is an interactive Cd were you control were you wont to go. 
There is a index to find the species you are looking for and section culture. 
Cost CN$30.00 or US$ pluss S & H.

    Jerry on Vancouver Island were it is cold and grey.


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