Plate VII. — Fig. i, Plant Ptychomitrium Leibergu. Fig. 2, Same X 22. 
Fig. 3, Leaf. Fig. 4, Base of leaf. Fig. 5, Apex of same. Fig. 6, Perichet- 
ial bud. Fig. 7, Calyptra. Fig 8, Spores. Fig. 9, Peristomial teeth. 
[ iuJM 
SOME ADDITIONS TO THE^FLORA OF MIDDLESEX COUNTY, 
MASSACHUSETTS. 
Reginald Heber Howe, Junior. 
The following plants were not included among the Lichens attributed to 
this County by Messrs. L. L. Dame and F. L. Collins in their List, pub- 
lished in 1888 The preface to the “Lichens” in the above work, will show 
that these additions are only a few, compared with those that may still be 
added, and are in no way remarkable. For the records from Sudbury, I am 
indebted to Miss C. M. Carr. 
1. Ramalina calicaris fraxinea Fr. 
This subspecies is not uncommon in Concord and Carlisle, on ash and 
elm trees. In only a few instances are the plants absolutely typical, the 
majority being somevhat intermediate between fraxinea and fastigiata. 
2. Cetraria Oakesiana Tuckerm. 
Not uncommon in' Concord, on base of conifers and birch. Reported 
from Sudbury. 
3 Usnea barbata florida rubiginea Michx. 
Not uncommon in Concord, growing in a reduced state on black spruces, 
white pines, and particularly on rocks. Always sterile. 
Usnea barbata ceratina Schser. 
I have one example referable here. 
5. Usnea barbata florida s trig os a Ach. 
Uncommon. Collected in Concord and Bedford on Maples. Fertile. 
6. Alectoria jubata implexa Fr. 
Reported from Sudbury, growing on larches in swamps. 
7. Physcia pulverulenta leucoleiptes Tuckerm. 
Common on elms, ash, oak, and apple trees. Rarely fertile. 
8. Physia obscura endochrysea Nyl. 
Reported from Sudbury, on Rocks. 
9. Peltigera scutata (Dicks.) Leight. 
One unfruited and poor specimen collected in Concord, was with some 
doubt referred hereby Dr. W. G. Farlow and Mr. G. K. Merrill. 
10. Stereocaulon condensation Hoffm. 
I have collected one example of this species in Concord, on an old stump 
and it is reported as not uncommon in Sudbury. 
11. Stereocaulon pileatum Ach. 
One example was found on a rock in Carlisle. I am indebted to Dr. 
Farlow for the determination. 
