266 ASCOMYCETES. 



most from this fungus ; red clover was less affected, though 

 the disease often had its origin in that species ; while white 

 clover was least often attacked. He recommends keeping out 

 Medicago from clover mixtures, and the addition of a large 

 proportion of grass-seeds. Fields badly affected should be 

 kept out of clover-cultivation for several years. English and 

 French white clovers he found to be very sensitive, but distri- 

 bution of the fungus did not take place by means of seed. 



Scl. tuberosa (Hedw.) (Britain and U.S. America). This 

 on the rhizomes of Anemone lumorosa causes formation of 

 sclerotia larger than filbert-nuts. The ascospores on germination 

 produce groups of flask-shaped processes from which are given 

 off chains of spherical conidia incapable of germination. Certain 

 pycnidia which appear on the anemone-plants or on the sclerotia 

 belong to a parasite (Pycnis sclerotivora Brefeld). 



Scl. bulborum Wakk.^ (Britain). Wakker observed this form 

 on hyacinth, onion, etc. It is very similar to Scl. trifoliorum, 

 but the hyacinth-fungus will not infect clover, and vice versa. 

 The leaves attacked become rotten and the plants die.^ 



Eriksson describes, from Wermland (Sweden), a destructive appearance of 

 bulb-rot due to sclerotia, which he attributed to Scl. FiicJceliana De Bary. 



Scl. candolleana Lev. on oak-leaves. 



Appendix. 



Sclerotia of Unknown Affinity. 



ScL oryzae Catt. Eice plants {Oi-yza sativa) are often 

 attacked by this Sclerotium, and a disease called " Brusone " 

 produced. The sclerotia are found during June in the sheaths 

 and stems. The symptoms are blackening at the base of plants 

 and withering of upper parts. 



Scl. rhizoides Auersw. occurs on living plants of Phalaris 

 arundinaeea, and Calamagrostis ; also on dead leaves of Dadylis 

 glomerata. 



Scl. rhinanthi Magn.^ forms sclerotia on the roots and root- 



^ Wakker, Allrjem. Vereenig. voor BloembollencvZtur, 1883-84; also Botan. 

 Centralblatt, xxix., 1887. 



^G. Massee {Gardener's Chronicle, Vol. xvi., 1894) gives description and 

 figures. 



^ Verhand. d. botan. Ver. d. Prov. Brandenburg, xxxv. 1894. 



