118 THE JOURNAL OF BOTANY 
Ls (Tilia vulgaris Hayne). Rare. Woodside. 
Witp Cuerry (Prunus Avium L.). The groups of asci _ 
visible, with a lens, on the under side of the leaves. The fun 
is Exoascus (Taphrina) Cerasi Sadeb. Abundant on clay si 
Cuntivatep Cuerry (Prunus Cerasus L.). The asci are evi- 
dent on the under surface of the leaves in June and July. £, 
ascus Cerast Sadeb. (E. deformans B Cerast oe eatinee 
HawrTuorn (Crategus Oxyacantha L. var. monogyna). Branch- 
ing of brooms sometimes dense and tortuous, at pine elongate 
and ascending. The leaves exhibit numerous brown patches in 
May and June, with which the asci are associated. Hxoascus 
ae Fiickel (Laphrina Crategi Sadeb.). Occasional. 
ELDER ( sagen 3 nigra Li.). One example only. Very rare. 
Round Biecan ar Luton 
Exum (Ulmus campestris Sm.). In June and July the 
Ulmi Johan (Hxoascus Ulmi Fickel). Rare. Limbury, Stock- 
wood, Wheathamstead. 
Wycxu Exo (Ulmus montana Sm.). Rare. Stockwood, Luton. 
ircH (Betula alba L., agg.). The fruiting cag epee on 
e under side of the leaves in a nes and Jun e brooms 
eb. 
dist tineb fr another to which these trees are shiek. In this 
the aha bs ie i eae by minute mites, Hriophyes rudis Canestrini, 
the irritation set up by them mene oe brooms to appear 
as outgrowths from the diseased buds (see Country Life, May, 
1904). This is confirmed by Mr. E. Cain: ay author of a work 
on British Galls. Frequent. 
Ss (Quercus pedunculata cae Rare, Luton Hoo. 
ECH tee sylvatica L.). se growth of weak branches 
on es main stem just below the sini branches was observed 
- a tree at Chaul End. As the leaves were swarmin 
tes, eek were — the Sa cause of the abnormal 
dapadespun Chaul End 
HazeL Gone Avellana L.). The leaves in July show brown 
patches, containing asci, the spores being ovoid and minutely dotted, 
probably the fruiting Stage of an “mana Rare. Chaul En a 
= may be observed on the leaves in June and July. The 
spores are brown, ovoid, nearly smooth, measuring about 6 by 9 p. 
