i6 
The Ohio Naturalist. 
[Vol. VII, No. 1, 
25. Perithecia inclined or horizontal, the ostioles usually opening into a 
common canal; situated in a stroma; algal cells Chroolepus. 
Astrotheliaceae. 
25. Perithecia erect with a single ostiole at the summit. 26. 
26. Perithecia in a stroma; algal cells belonging to Chroolepus. 
Trypetheliaceae. 
26. Perithecia single; storma wanting. 27. 
27. Spores one-celled (in our species); algae belonging to Pleurococcus 
or Palmella. Verucariaceae. 
27. Spores one to multiseptate (in our species); algal cells belonging to 
Chroolepus. Pyrenulaceae. 
PUBESCENCE AND OTHER EXTERNAL PECULIARITIES OF 
OHIO PLANTS. 
Edna M. McCleery. 
In this study of the protective coverings and other peculiar¬ 
ities of the leaves and twigs of Ohio plants, the entire state her¬ 
barium has been examined and the plants classified under the 
following heads: 
1. Pubescent—(a) glandular, (b) stellate, (c) tomentose; 
2. Glabrous; 
3. Glaucous; 
4. Granular; 
5. Scurfy; 
6. Resin dotted, punctate, peltate scales. 
In some cases it has been difficult to classify certain species 
on account of many of the forms merging almost imperceptibly 
from one to another. This is noticeable especially in pubes¬ 
cent and tomentose forms. In other cases the difficulty in class¬ 
ification has come from the change which takes place during de¬ 
velopment from the young to the mature condition. 
In Salix Candida, for instance, the leaves are loosely tomen¬ 
tose when young, but become glabrate above when mature. In 
Quereus nana the leaves are stellate pubescent above when young 
but become glabrous when mature, while in Quereus minor the 
young twigs are tomentulose but the mature ones glabrous. In 
all cases of this kind the forms have been listed under two or 
more heads. 
The entire number of reported Ohio vascular plants is about 
2200. Of these about 2125 are angiosperms, 10 gymnospermes, 
and 70 pteridophytes. 904 plants were found to be pubescent. 
This includes all degrees and varities of pubescence from those 
with only a soft fine pubescence like the clover and Oxalis to those 
with heavy hairs like the nettles or thistles. For a dense velvety 
pubescence of both twigs and leaves Althaea officinalis might be 
examined; for hirsute pubescence of both twigs and leaves Ascle- 
pias tuberosa is a good example; for soft downy pubescence 
