THE HUSTS OF NOVA SCOTIA. — FRA8EH. 845 



laiiiily ::. .AIELAMPiORACEAE. 



Basidi:i e.\t<'rnal, i. e. gerniination with ii typical pro- 

 mycelium with small sj)lu'i-ieal sporidia. Telia in more or less 

 definite single layered crusts. Teliospores compacted laterally 

 into layers, or rarely solitary within the tissues (Ui'edinopsis), 

 sessile; \vall nsually firm, rarely with an outer gelatinous 

 layer. 



This family is represented in north-eastern ISTorth America 

 hy eight genera, and of these* seven occur in ISTova Scotia. The 

 remaining genus Hyalopsora, which is confined to ferns, prob- 

 ably occurs, as H. Aspidiotus (Peck) Magn. on Phegopteris 

 Dryopteris (L.) Fee has been reported from jSTew Hampshire, 

 and H. Polypodii on Ci/sfopteris fragiUs Bernh. from ^N'ew 

 York. 



.MKI,AM PSORA Cast. 



Pycnia conoidal or hemispheric without ostiolar filaments, 

 hymenium flatfish. Aecia without peridium or paraphyseo. 

 Uredinia without i>eridium. ITrediniospores borne singly on 

 pedicels; wall colourless, verrucose; capitate paraphyses inter- 

 mixed with the spores. Telia indehiscent in waxy layers or 

 crusts. Teliospores one-celled, closely compacted into a single 

 layer, prismatic or ellipsoid ; wall smooth, coloured. 



Both het^roecious and autoecious species belong to this 

 genus, the former only have l3een found in Nova Scotia. 

 Melampsora lini (Pers.) Tul. is an autoecious species which is 

 destructive to flax in the United States. 



Melampsora Bigelowii Thuem. 



Uredo Bigelovjii (Thuem.) Arth. 



0. Pycnia chiefly epiphyllous, scattered, minute, puncti- 

 forai, pale yellow, inconspicuous. 



1. Aecia chiefly hypophyllous, scattered or somewhat gre- 

 garious, on whitish are^s occupying part of the leaf, small, 

 round or mostly oblong, pale yellow fading to colourless, soon 



