I thought some of you might be interested in this:

Table excerpted from "Ergot Peptide Alkaloid Spectra of Claviceps-Infected Tall
Fescue, Wheat, and Barley" by James K. Porter, Charles W. Bacon, Ronald D.
Plattner, and Richard F. Arrendale.  J. Agric. Food Chem. 1987 (35) 359-361.

     Relative Percent Ergopeptide Alkaloids in the Crude Alkaloid Fraction
                            (Determined by MS/MS)

    alkaloid           [Claviceps purpurea grown on] fescue  barley   wheat
    ------------------------------------------------ ------  ------  ------
    ergotamine                                        35.80   48.96    9.59
    ergosine and Beta-ergosine                        26.96    3.77    1.97
    ergonine                                           0.11    0.14    none
    ergovaline                                         0.30    2.22    0.44
    ergostine                                          0.85    0.39    0.74
    ergoptine and Beta-ergotine                        0.18    0.10    0.17
    ergocornine                                        2.22    6.86    6.64
    ergocristine                                      30.65   27.72   75.77
    ergocryptine and Beta-ergocryptine                 2.95    9.85    4.67
    
    total (PDAB)                                       0.46    0.92    1.10
                                                       mg/g    mg/g    mg/g

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[more data from another source:]

host                average weight % alkaloids
                     sclerotium      water
                        (mg)    soluble insoluble
Lolium perenne          9       .025    .292
Lolium perenne          8       .012    .209
Lolium perenne          7.6     .023    .224
Festuca arundinacea     7.8     .014    .192
Arrhenatherum elatius   5.9     .023    .3
Dactylis glomerata      3.8     .026    .455
Dactylis glomerata      4.1     .037    .716
Phalaris arundinacea    2.6     .021    .437
Holcus mollis           1.5
Alopecurus geniculatus  1.4
Molinea caerulea        2.1     .033    .625
Molinea caerulea        1.8     .042    .507
Molinea caerulea        2.1
Glyceria fluitans       12.1    0       0
Secale cereala          49.3    .039    .282

Don't take that soluble to literally, the solubles ones, like ergometrine, in
the range of 1/40 while the insoluble, like ergotamine, is soluble in the
1/500 - 1/3000 range


A. Reicher, E.T. Elema, J.H. Zwaving, Th.M. Malingré
Alkaloids in ergot found on different Gramineae in the Netherlands
Pharmaceutisch Weekblad Scientific Edition, 5 (1983) 234-238

Has some nice pointers, I've included the procedure in above paper below:

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"0.5g of powdered material was shaken vigorously for 3 hours with 30.0g
of a mixture of 1 part of ammonia 25%, 9 parts of methanol and 90 parts
of chloroform (wt/wt). After filtration 15.0g of the filtrate was used
in the assay method of the dutch pharmacopoeia VI 2nd printing for Secale
cornutum.

6g of the filtrate was evaporated in vacuo at 40C, the residue disolved in 3
part chloroform and one volume methanol to make a solution that contains about
0.5mg of total alkaloids per ml. This solution was used immediatly because of
possible convertion of lysergicacid alkaloids into their iso- counterparts.

Thin layer chromatography was carried out with prefabricated silicagel plate
(Merck 5721). Plates were impregnated by developing in a 30% (vol/vol) solution
of formamide in acetone over a distance of 18cm. These plates can be stored
in a desiccator over formamide for one day. 1 uL of the test sollution and 1uL
of the reference solution were applied seperatly to the plate. The plates were
developed using a mixute of 70 volumes of diisopropyl ether, 15 volumes of
tetrahydrofuran, 15 volumes of toluene and 0.1 volume of diethylformamide in
an unsaturated chamber over a distance of 15 cm. After development the plate
was dried in the air and examined in ultraviolet light at 365 nm. The alkaloids
showed blue fluorecent spots.

Rf values

a + B-ergokryptine 0.91
ergocorninine            0.80
ergocristinine           0.76
B-ergokryptine           0.69
a-ergokryptine           0.67
erostinine               0.59
ergocornine              0.55
ergocristine             0.49
ergosinine               0.43
ergotaminine             0.32
ergostine                0.20
ergosine                 0.16
ergotamine               0.11
ergometrinine            0.07
ergometrine              0.02