apologies for getting back somewhat tardily.
I'm afraid I can't find anything fungal on the Cyperus
; however the collection on Agapanthus
is far more promising. As there appear to be only three conidiomata on the collection I had to be careful - it's easy not to get a preparation right the first time with something as tiny (about 0.2mm!) as this.
Under the microscope it was immediately clear that I was dealing with a Phomopsis
species. This large genus comprises anamorphs of Diaporthe
(although often a perfect Diaporthe
state is not known). Phomopsis
is characterised by having either α-conidia which are ellipsoid with ± pointed ends and usually with two large guttules, and/or β-conidia which are linear and curved at one end ; rather rarely a third sort of conidium may be involved. Examples of α-conidia (and the third kind) can be seen here: http://www.ascofrance.com/search_recolte/4461
and α-conidia only here: http://www.ascofrance.com/search_recolte/3850
(click on thumbnails).
A literature search came up with a relatively-recently described Phomopsis
: http://www.fieldmycology.net/FRDBI/FRDB ... BNum=47948
to be the only record to date). I have found the original description in Kew Bulletin
60: pp.149-158 (2005). Here is the page where the species is illustrated:
and here a couple of images from the Guernsey find:
Although the conidial measurements of the Guernsey collection are larger than those of the Kew one I think it doubtful that there would be two separate Phomopsis
species on this host in this country. So I would call this collection Phomopsis agapanthi
Punith. & Spooner with the proviso that it would be desirable to have further material for examination to chec k the range of conidial size - the Guernsey material is very scant compared to that from Kew (see the illustration above). I also need to have a careful look - if I can - at the structure of the conidiophores.